Difference between revisions of "Marble/C3/Celestial-Bodies-and-Constellations/English"

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'''System Requirements'''
 
'''System Requirements'''
 
|| To record this tutorial, I am using,  
 
|| To record this tutorial, I am using,  
−
 
+
*'''Ubuntu Linux OS''', version 16.04  
−
'''Ubuntu Linux OS''', version 16.04  
+
*'''Marble '''version 1.12.20 and
−
 
+
*A working internet connection
−
'''Marble '''version 1.12.20 and
+
−
 
+
−
A working internet connection
+
  
  
 
The process demonstrated is this tutorial is identical in  
 
The process demonstrated is this tutorial is identical in  
−
 
+
*'''Ubuntu Linux OS''', version 18.04  
−
'''Ubuntu Linux OS''', version 18.04  
+
*'''Marble '''version 2.2.20
−
 
+
−
'''Marble '''version 2.2.20
+
−
 
+
−
 
+
  
 
|-
 
|-
Line 53: Line 46:
 
|-
 
|-
 
|| Cursor on the interface.
 
|| Cursor on the interface.
−
|| I have opened the Marble interface in '''Atlas view.'''
+
|| I have opened the '''Marble''' interface in the default '''Atlas view.'''
−
 
+
  
 
|-
 
|-
Line 63: Line 55:
  
 
Hide Compass and Scalebar plugins.
 
Hide Compass and Scalebar plugins.
−
||I will hide Overview map, Compass and Scalebar for clarity.
+
||I will hide '''Overview map, Compass''' and '''Scalebar''' for clarity.
 
|-
 
|-
−
|| Point to the interface .
+
|| Point to the interface.
  
  
Line 73: Line 65:
 
|| Black coloured surface on the interface represents the sky on a clear night.
 
|| Black coloured surface on the interface represents the sky on a clear night.
  
−
When we rotate the globe we can see various views of a wide extensive sky.
+
When we rotate the globe, we can see various views of a wide extensive sky.
  
 
We can see various objects present in the sky.
 
We can see various objects present in the sky.
  
 
These objects are called celestial bodies.
 
These objects are called celestial bodies.
−
 
−
 
  
 
|-
 
|-
 
|| Cursor on the interface.
 
|| Cursor on the interface.
  
−
Click on Settings, select Panels,
+
Click on Settings >> select Panels >> select Hide All Panels.
−
 
+
−
>> select Hide All Panels.
+
 
|| We will now hide all the panels.
 
|| We will now hide all the panels.
  
−
Go to the Settings menu and select Panels.
+
Go to the '''Settings''' menu and select '''Panels'''.
  
−
From the sub-menu select Hide All Panels.
+
From the sub-menu select '''Hide All Panels'''.
 
|-
 
|-
 
|| Rotate the globe.
 
|| Rotate the globe.
  
 
Point to Sun, Moon stars and others.
 
Point to Sun, Moon stars and others.
−
||  
+
|| To see more objects in the sky let us keep rotating the globe.
−
 
+
−
To see more objects in the sky let us keep rotating the globe.
+
  
−
Notice that we can see Sun, Moon, stars and other celestial bodies.
+
Notice that we can see sun, moon, stars and other celestial bodies.
 
|-
 
|-
 
|| Point to the stars.
 
|| Point to the stars.
Line 112: Line 98:
  
 
|| Our best estimates tell us that the Milky Way is made up of approximately 100 billion stars.
 
|| Our best estimates tell us that the Milky Way is made up of approximately 100 billion stars.
−
 
  
 
|-
 
|-
 
|| Cursor on the interface.
 
|| Cursor on the interface.
−
|| Let us now configure the settings for stars in the''' Marble '''interface
+
|| Let us now configure the '''settings''' for stars in the''' Marble '''interface
  
 
|-
 
|-
−
|| Click on the '''Settings''' Menu
+
|| Click on '''Settings''' >> select''' Configure Marble Virtual Globe''' option
−
 
+
−
Select''' Configure Marble Virtual Globe''' option
+
  
 
'''Configure '''window opens
 
'''Configure '''window opens
 +
|| Click on the '''Settings''' menu.
  
 +
Select''' Configure Marble Virtual Globe''' option.
  
−
|| Click on the '''Settings''' Menu
+
'''Configure '''window opens.
−
 
+
−
Select''' Configure Marble Virtual Globe''' option
+
−
 
+
−
'''Configure '''window opens
+
 
|-
 
|-
 
|| From the left panel, select '''Plugins''' option
 
|| From the left panel, select '''Plugins''' option
Line 137: Line 118:
  
 
Point to the scroll bar at the right side of the '''plugins''' menu
 
Point to the scroll bar at the right side of the '''plugins''' menu
−
|| From the left panel, select the '''Plugins''' tab
+
|| From the left panel, select the '''Plugins''' tab.
  
−
'''Plugins '''menu opens in the right panel
+
'''Plugins '''menu opens in the right panel.
  
−
At the extreme right of the '''Plugins''' menu we see a scroll bar
+
At the extreme right of the '''Plugins''' menu we see a scroll bar.
  
 
|-
 
|-
 
|| Scroll down and locate '''Stars '''plugin
 
|| Scroll down and locate '''Stars '''plugin
  
−
In the '''Plugins '''menu click on the Configure button corresponding to Stars
+
'''Plugins '''menu >> click on the Configure button corresponding to Stars
−
|| Let us scroll down and locate '''Stars '''plugin
+
|| Let us scroll down and locate '''Stars plugin'''.
−
 
+
−
Click on the C'''onfigure''' button corresponding to '''Stars'''
+
−
 
+
  
 +
Click on the '''Configure''' button corresponding to '''Stars'''
  
 
|-
 
|-
 
|| Point to''' Configure Stars Plugin- '''window  
 
|| Point to''' Configure Stars Plugin- '''window  
  
−
We can notice two tabs namely '''Celestial Objects '''and '''Lines and Orientation.'''
+
Point to the two tabs namely '''Celestial Objects '''and '''Lines and Orientation.'''
  
  
−
'''Celestial Objects''' tab opens by default
+
Point to '''Celestial Objects''' tab
 
|| '''Configure Stars Plugin- Marble Virtual Globe '''window opens
 
|| '''Configure Stars Plugin- Marble Virtual Globe '''window opens
  
 
This window has two tabs, '''Celestial Objects '''and '''Lines and Orientation.'''
 
This window has two tabs, '''Celestial Objects '''and '''Lines and Orientation.'''
  
−
'''Celestial Objects''' tab opens by default
+
'''Celestial Objects''' tab opens by default.
  
 
|-
 
|-
 
|| Point to the different options in the '''Celestial Objects''' tab
 
|| Point to the different options in the '''Celestial Objects''' tab
−
|| In the '''Celestial Objects''' tab, we can see different sections
+
|| In the '''Celestial Objects''' tab, we can see different sections.
  
 
|-
 
|-
 
|| Point to '''Star Magnitude Limit '''section
 
|| Point to '''Star Magnitude Limit '''section
−
|| Go to '''Star Magnitude Limit'''
+
|| Go to '''Star Magnitude Limit'''.
  
  
−
'''Star Magnitude Limit '''represents the magnitude of stars seen on the interface
+
'''Star Magnitude Limit '''represents the magnitude of stars seen on the interface.
  
 
|-
 
|-
Line 187: Line 166:
  
 
Click on the '''OK''' button in the Configure window
 
Click on the '''OK''' button in the Configure window
−
|| Under '''Star Magnitude Limit '''we can see a slider to change the magnitude
+
|| Under '''Star Magnitude Limit '''we can see a slider to change the magnitude.
  
 
Drag the slider to 0 magnitude.
 
Drag the slider to 0 magnitude.
  
−
Click on the''' OK''' button in the window
 
  
−
Click on the '''OK '''button in the Configure window
+
Click on the''' OK''' button in the window.
 +
 
 +
 
 +
Click on the '''OK '''button in the '''Configure''' window.
 
|-
 
|-
 
|| Point to the plain black surface.
 
|| Point to the plain black surface.
Line 201: Line 182:
 
Now we can clearly see the celestial bodies.
 
Now we can clearly see the celestial bodies.
 
|-
 
|-
−
||  
+
||Right-click anywhere >> context menu >> select Configure option 
−
|| To open Configure Stars Plugin window, right-click anywhere on the black sky.
+
|| To open '''Configure Stars Plugin''' window, right-click anywhere on the black sky.
  
−
A context menu opens.
+
A context menu opens..
  
−
Select Configure option from the menu.
+
Select '''Configure''' option from the menu.
 
|-
 
|-
 
|| Point to '''Solar System''' option
 
|| Point to '''Solar System''' option
Line 219: Line 200:
 
|-
 
|-
 
|| Point to the checked boxes.
 
|| Point to the checked boxes.
−
|| By default Sun and Moon check-boxes are checked.
+
|| By default, sun and moon check-boxes are checked.
 
|-
 
|-
 
|| Check the boxes of all the planets.
 
|| Check the boxes of all the planets.
Line 227: Line 208:
 
|| Observe that we cannot click on Earth check-box as we are observing from Earth.
 
|| Observe that we cannot click on Earth check-box as we are observing from Earth.
 
|-
 
|-
−
|| Point to these check-boxes
+
|| Point to these 2 check-boxes
−
|| Next we have two more check-boxes
+
|| Next we have two check-boxes-
  
 
'''Use name labels''' and '''Magnify Sun and Moon.'''
 
'''Use name labels''' and '''Magnify Sun and Moon.'''
Line 239: Line 220:
 
|-
 
|-
 
|| Point to '''Other '''section
 
|| Point to '''Other '''section
−
|| '''Other '''section''' '''represents '''Deep Sky objects.'''
+
|| '''Other '''section represents '''Deep Sky objects.'''
  
 
For now we will leave them as default.
 
For now we will leave them as default.
  
 
|-
 
|-
−
|| click on the '''OK '''button''' '''in the window
+
|| Click on the '''OK '''button
  
 
Point to Sun in the sky.
 
Point to Sun in the sky.
  
−
|| Now click on the '''OK '''button''' '''in the window
+
|| Now click on the '''OK '''button in the window.
−
 
+
  
 
|-
 
|-
 
|| Point to the objects which form some shapes .
 
|| Point to the objects which form some shapes .
−
|| We can see some lines and shapes in the sky. They are constellations
+
|| We can see some lines and shapes in the sky. They are constellations.
  
 
|-
 
|-
Line 259: Line 239:
  
 
Constellations
 
Constellations
−
|| Let us see what are constellations
+
|| Let us see what are constellations.
  
  
 
A constellation is a group of stars which forms an imaginary shape in the night sky.  
 
A constellation is a group of stars which forms an imaginary shape in the night sky.  
−
In''' Latin, Stella''' means a star and '''constellation''' means a set of stars
+
 
 +
 
 +
In''' Latin, Stella''' means a star and '''constellation''' means a set of stars.
  
 
|-
 
|-
Line 272: Line 254:
 
Constellations
 
Constellations
 
||Constellations are usually named after mythological characters, people, animals and objects.
 
||Constellations are usually named after mythological characters, people, animals and objects.
 +
 +
 
It is like a game of connecting the dots.
 
It is like a game of connecting the dots.
 +
 +
 
The visible night sky is divided into 88 constellations by astronomers.  
 
The visible night sky is divided into 88 constellations by astronomers.  
 +
 
Out of which 12 are zodiac signs
 
Out of which 12 are zodiac signs
−
 
  
 
|-
 
|-
−
|| Go to Settings menu and select Configure Marble Virtual Globe option.
+
|| Settings menu >> select Configure Marble Virtual Globe option
−
|| For better visibility I will change the colour of the constellations.
+
|| For better visibility, I will change the colour of the constellations.
  
 
|-
 
|-
Line 287: Line 273:
  
 
Select Configure option from the menu.
 
Select Configure option from the menu.
−
|| To open Configure Stars Plugin window, right-click anywhere on the black sky.
+
|| To open '''Configure Stars Plugin''' window, right-click anywhere on the black sky.
  
−
Select Configure option from the context menu.
+
Select '''Configure''' option from the context menu.
 
|-
 
|-
 
|| '''Configure Stars Plugin- '''window opens  
 
|| '''Configure Stars Plugin- '''window opens  
  
 
Click on the '''Lines and Orientation''' tab
 
Click on the '''Lines and Orientation''' tab
−
|| '''Configure Stars Plugin- '''window opens
+
|| '''Configure Stars Plugin- '''window opens.
  
−
Click on the '''Lines and Orientation''' tab
+
Click on the '''Lines and Orientation''' tab.
 
|-
 
|-
−
|| Under '''Constellations '''Point to the checkboxes '''Lines '''and''' Labels.'''
+
|| Under '''Constellations '''>> point to the checkboxes '''Lines '''and''' Labels.'''
  
 
Click on the box corresponding to '''Lines.'''
 
Click on the box corresponding to '''Lines.'''
−
|| Under '''Constellations, '''we can see two checkboxes '''Lines '''and''' Labels.'''
+
|| Under '''Constellations, '''we can see two checkboxes- '''Lines '''and''' Labels.'''
  
 
Click on the button corresponding to '''Lines.'''
 
Click on the button corresponding to '''Lines.'''
Line 310: Line 296:
 
Select yellow colour from the box.
 
Select yellow colour from the box.
  
−
Click on the '''ok''' button in the box
+
Click on the '''ok''' button
 
|| Colour window opens.
 
|| Colour window opens.
  
Line 328: Line 314:
 
From the colour window I will select red colour.
 
From the colour window I will select red colour.
  
−
Click on the '''OK '''button in the window
+
Click on the '''OK '''button in the window.
−
 
+
−
 
+
  
 
|-
 
|-
 
|| Point to '''Names'''. Point to the dropdown button corresponding to '''Names.'''
 
|| Point to '''Names'''. Point to the dropdown button corresponding to '''Names.'''
  
−
Click on the dropdown button. Latin name is selected by default.
+
Click on the dropdown button. '''Latin Name''' is selected.
−
 
+
−
I will leave it as default.
+
  
 
|| Below '''Labels''' we can see''' Names '''drop-down.  
 
|| Below '''Labels''' we can see''' Names '''drop-down.  
  
−
In the drop-down Latin name is selected by default.
+
In the drop-down, '''Latin Name''' is selected by default.
  
 
I will leave it as it is.
 
I will leave it as it is.
Line 348: Line 330:
  
 
Point to '''Celestial Equator, Celestial Poles, '''and''' Ecliptic''' checkboxes
 
Point to '''Celestial Equator, Celestial Poles, '''and''' Ecliptic''' checkboxes
−
|| Next is the Coordinate''' Grid''' section
+
|| Next is the '''Coordinate Grid''' section.
  
−
Under the Coordinate''' Grid, '''we see '''Celestial Equator, Celestial Poles '''and''' Ecliptic''' checkboxes
+
Under the Coordinate''' Grid, '''we see '''Celestial Equator, Celestial Poles '''and''' Ecliptic''' checkboxes.
  
 
I will leave them as default.
 
I will leave them as default.
Line 357: Line 339:
 
|| Now let us make the stars visible on the interface.
 
|| Now let us make the stars visible on the interface.
  
−
Click on the '''Celestial Objects''' tab
+
Click on the '''Celestial Objects''' tab.
  
 
|-
 
|-
−
|| Under '''Star Magnitude Limit ,''' drag the slider to 7 magnitude
+
|| Under '''Star Magnitude Limit >>''' drag the slider to 7 magnitude
  
  
 
Click on the '''OK''' button in the box
 
Click on the '''OK''' button in the box
−
|| Under '''Star Magnitude Limit ,''' drag the slider to 7 magnitude
+
|| Under '''Star Magnitude Limit ,''' drag the slider to 7 magnitude.
−
Click on the '''OK '''button in the box
+
  
  
 +
Click on the '''OK '''button in the box
  
 
|-
 
|-
 
|| Point to the constellations.
 
|| Point to the constellations.
−
|| We can see the changes in the Lines and Labels of each constellation.
+
|| We can see the changes in the '''Lines''' and '''Labels''' of each constellation.
 
|-
 
|-
 
|| Rotate and point to each constellations.
 
|| Rotate and point to each constellations.
Line 384: Line 366:
  
  
−
|| Let us summarise  
+
|| Let us summarise.
  
 
In this tutorial we have learnt about
 
In this tutorial we have learnt about
Line 393: Line 375:
 
|-
 
|-
 
||  
 
||  
−
|| As an Assignment
+
|| As an assignment
−
 
+
−
Explore more about the '''Coordinate Grid '''option
+
−
 
+
−
Hint: Use Celestial Objects tab in '''Stars plugin.'''
+
  
 +
*Explore more about the '''Coordinate Grid '''option
  
 +
*Hint: Use '''Celestial Objects''' tab in '''Stars plugin.'''
  
 
|-
 
|-

Revision as of 23:56, 20 July 2020

Visual Cue
Narration
Slide Number 1

Title slide

Welcome to this Spoken tutorial on Celestial Bodies and Constellations.
Slide Number 2

Learning Objectives


In this tutorial we will learn about,
  • Celestial bodies
  • Stars and constellations
  • Configure the setting of stars and constellations
Slide Number 3

System Requirements

To record this tutorial, I am using,
  • Ubuntu Linux OS, version 16.04
  • Marble version 1.12.20 and
  • A working internet connection


The process demonstrated is this tutorial is identical in

  • Ubuntu Linux OS, version 18.04
  • Marble version 2.2.20
Slide Number 4

Pre-requisites

https://spoken-tutorial.org

To practise this tutorial, learner should be familiar with Marble interface

For the prerequisite Marble tutorials, please visit this site.

Cursor on the interface. I have opened the Marble interface in the default Atlas view.
Drag the - button on the windrose Let us zoom out to see the black sky.
Right-click on Overview map, select Hide option from context menu.

Hide Compass and Scalebar plugins.

I will hide Overview map, Compass and Scalebar for clarity.
Point to the interface.


Point to the dark surface on the interface.

Rotate the globe and point to the sky .

Black coloured surface on the interface represents the sky on a clear night.

When we rotate the globe, we can see various views of a wide extensive sky.

We can see various objects present in the sky.

These objects are called celestial bodies.

Cursor on the interface.

Click on Settings >> select Panels >> select Hide All Panels.

We will now hide all the panels.

Go to the Settings menu and select Panels.

From the sub-menu select Hide All Panels.

Rotate the globe.

Point to Sun, Moon stars and others.

To see more objects in the sky let us keep rotating the globe.

Notice that we can see sun, moon, stars and other celestial bodies.

Point to the stars.

Point to the sun.

Here we can see the countless bright stars in the sky.

The nearest star to the Earth is the Sun.

Point to the stars. Our best estimates tell us that the Milky Way is made up of approximately 100 billion stars.
Cursor on the interface. Let us now configure the settings for stars in the Marble interface
Click on Settings >> select Configure Marble Virtual Globe option

Configure window opens

Click on the Settings menu.

Select Configure Marble Virtual Globe option.

Configure window opens.

From the left panel, select Plugins option

Point to Plugins menu

Point to the scroll bar at the right side of the plugins menu

From the left panel, select the Plugins tab.

Plugins menu opens in the right panel.

At the extreme right of the Plugins menu we see a scroll bar.

Scroll down and locate Stars plugin

Plugins menu >> click on the Configure button corresponding to Stars

Let us scroll down and locate Stars plugin.

Click on the Configure button corresponding to Stars

Point to Configure Stars Plugin- window

Point to the two tabs namely Celestial Objects and Lines and Orientation.


Point to Celestial Objects tab

Configure Stars Plugin- Marble Virtual Globe window opens

This window has two tabs, Celestial Objects and Lines and Orientation.

Celestial Objects tab opens by default.

Point to the different options in the Celestial Objects tab In the Celestial Objects tab, we can see different sections.
Point to Star Magnitude Limit section Go to Star Magnitude Limit.


Star Magnitude Limit represents the magnitude of stars seen on the interface.

Point to the slider under Star Magnitude Limit

Drag slider to 0 magnitude.


Click on the OK button in the box


Click on the OK button in the Configure window

Under Star Magnitude Limit we can see a slider to change the magnitude.

Drag the slider to 0 magnitude.


Click on the OK button in the window.


Click on the OK button in the Configure window.

Point to the plain black surface. Notice that stars have disappeared from the interface.

Now we can clearly see the celestial bodies.

Right-click anywhere >> context menu >> select Configure option To open Configure Stars Plugin window, right-click anywhere on the black sky.

A context menu opens..

Select Configure option from the menu.

Point to Solar System option In the Configure Stars Plugin window, next section isSolar System
Scroll down and show the names of planets.

Scroll down.

This section has check-boxes for Sun, Moon and planets in the solar system.

Let us scroll down to see all the check-boxes.

Point to the checked boxes. By default, sun and moon check-boxes are checked.
Check the boxes of all the planets. We will check all the boxes to see the planets in the sky.
Point to Earth check-box. Observe that we cannot click on Earth check-box as we are observing from Earth.
Point to these 2 check-boxes Next we have two check-boxes-

Use name labels and Magnify Sun and Moon.


By default these boxes are checked.

Point to the check-boxes. These check-boxes are used to show the names of sun, moon and other planets.
Point to Other section Other section represents Deep Sky objects.

For now we will leave them as default.

Click on the OK button

Point to Sun in the sky.

Now click on the OK button in the window.
Point to the objects which form some shapes . We can see some lines and shapes in the sky. They are constellations.
Slide 6

Constellations

Let us see what are constellations.


A constellation is a group of stars which forms an imaginary shape in the night sky.


In Latin, Stella means a star and constellation means a set of stars.

Slide 7

Constellations

Constellations are usually named after mythological characters, people, animals and objects.


It is like a game of connecting the dots.


The visible night sky is divided into 88 constellations by astronomers.

Out of which 12 are zodiac signs

Settings menu >> select Configure Marble Virtual Globe option For better visibility, I will change the colour of the constellations.
Right-click anywhere on the black sky.

Point to context menu

Select Configure option from the menu.

To open Configure Stars Plugin window, right-click anywhere on the black sky.

Select Configure option from the context menu.

Configure Stars Plugin- window opens

Click on the Lines and Orientation tab

Configure Stars Plugin- window opens.

Click on the Lines and Orientation tab.

Under Constellations >> point to the checkboxes Lines and Labels.

Click on the box corresponding to Lines.

Under Constellations, we can see two checkboxes- Lines and Labels.

Click on the button corresponding to Lines.

Point to colour window.

Select yellow colour from the box.

Click on the ok button

Colour window opens.

I will select yellow colour from the window.

Click on the OK button in the window

Click on the box corresponding to Labels.

From the colour box select rose colour.

Click on the ok button in the box

Next click on the button corresponding to Labels.

From the colour window I will select red colour.

Click on the OK button in the window.

Point to Names. Point to the dropdown button corresponding to Names.

Click on the dropdown button. Latin Name is selected.

Below Labels we can see Names drop-down.

In the drop-down, Latin Name is selected by default.

I will leave it as it is.

Point to Coordinate Grid section

Point to Celestial Equator, Celestial Poles, and Ecliptic checkboxes

Next is the Coordinate Grid section.

Under the Coordinate Grid, we see Celestial Equator, Celestial Poles and Ecliptic checkboxes.

I will leave them as default.

Click on the Celestial Objects tab Now let us make the stars visible on the interface.

Click on the Celestial Objects tab.

Under Star Magnitude Limit >> drag the slider to 7 magnitude


Click on the OK button in the box

Under Star Magnitude Limit , drag the slider to 7 magnitude.


Click on the OK button in the box

Point to the constellations. We can see the changes in the Lines and Labels of each constellation.
Rotate and point to each constellations.

Gemini, Cancer, Leo, Virgo, Libra, Scorpio, Sagittarius, Capricorn, Aquarius and Pisces.

Rotate the globe to see the various zodiac signs.
Slide Number 8

Summary


Let us summarise.

In this tutorial we have learnt about

  • Celestial bodies
  • Stars and constellations
  • Configure the settings of stars and constellations
As an assignment
  • Explore more about the Coordinate Grid option
  • Hint: Use Celestial Objects tab in Stars plugin.
Slide Number 8

Spoken tutorial workshop

The video at the following link summarizes the Spoken Tutorial project.

Please download and watch it.

Slide Number 9

Spoken Tutorial workshops

The Spoken Tutorial Project team:

conducts workshops using spoken tutorials and gives certificates.

For more details, please write to us.

Slide Number 10

Forum for specific questions

Please post your timed queries in this forum.
Slide Number 11

Acknowledgement

Spoken Tutorial Project is funded by,

  • National Mission on Education through ICT and
  • Pandit Madan Mohan Malaviya National Mission on Teachers and Teaching,


MHRD,Government of India.

Spoken Tutorial Project is funded by,

MHRD, Government of India.


This tutorial is contributed by Viji Nair and Madhuri Ganapathi from IIT Bombay. Thank you for watching.

Contributors and Content Editors

Madhurig, Nancyvarkey, Snehalathak, Vijinair

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