Marble/C3/Celestial-Bodies-and-Constellations/English-timed

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Time
Narration
00:01 Welcome to this Spoken tutorial on Celestial Bodies and Constellations.
00:05 In this tutorial we will learn about,

Celestial bodies, Stars and constellations

00:11 Configure the setting of stars and constellations.
00:15 To record this tutorial, I am using, Ubuntu Linux OS version 16.04
00:23 Marble version 1.12.20 and
00:27 A working internet connection
00:30 The process demonstrated is this tutorial is identical in,
00:35 Ubuntu Linux OS, version 18.04
00:38 Marble version 2.2.20
00:43 To practise this tutorial, learner should be familiar with Marble interface.
00:48 For the prerequisite Marble tutorials, please visit this site.
00:53 I have opened the Marble interface in the default Atlas view.
00:58 Let us zoom out to see the black sky.
01:02 I will hide Overview map, Compass and Scalebar for clarity.
01:09 Black coloured surface on the interface represents the sky on a clear night.
01:15 When we rotate the globe, we can see various objects present in the sky.
01:21 These objects are called celestial bodies.
01:24 We will now hide all the panels.
01:27 Go to the Settings menu and select Panels.
01:30 From the sub-menu select Hide All Panels.
01:35 To see more objects in the sky let us keep rotating the globe.
01:40 Notice that we can see sun, moon, stars and other celestial bodies.
01:47 Here we can see the countless bright stars in the sky.
01:51 The nearest star to the Earth is the Sun.
01:54 Our best estimates tell us that the Milky Way is made up of approximately 100 billion stars.
02:01 Let us now configure the settings for stars in the Marble interface
02:06 Click on the Settings menu. Select Configure Marble Virtual Globe option.
02:12 Configure window opens.
02:14 From the left panel, select the Plugins tab.
02:17 Plugins menu opens in the right panel.
02:21 At the extreme right of the Plugins menu we see a scroll bar.
02:26 Let us scroll down and locate Stars plugin.
02:30 Click on the Configure button corresponding to Stars.
02:34 Configure Stars Plugin window opens.
02:38 This window has two tabs, Celestial Objects and Lines and Orientation.
02:46 Celestial Objects tab opens by default.
02:50 In the Celestial Objects tab, we can see different sections.
02:54 Go to Star Magnitude Limit.
02:57 Star Magnitude Limit represents the magnitude of stars seen on the interface.
03:03 Under Star Magnitude Limit we can see a slider to change the magnitude.
03:08 Drag the slider to 0 magnitude.
03:11 Click on the OK button in the window.
03:14 Click on the OK button in the Configure window.
03:17 Notice that stars have disappeared from the interface.
03:22 Now we can clearly see the celestial bodies.
03:25 To open Configure Stars Plugin window, right-click anywhere on the black sky.
03:31 A context menu opens..
03:33 Select Configure option from the menu.
03:37 In the Configure Stars Plugin window, next section is Solar System
03:43 This section has check-boxes for Sun, Moon and planets in the solar system.
03:49 Let us scroll down to see all the check-boxes.
03:52 By default, sun and moon check-boxes are checked.
03:57 We will check all the boxes to see the planets in the sky.
04:01 Observe that we cannot click on Earth check-box as we are observing from Earth.
04:07 Next we have two check-boxes.
04:09 Use name labels and Magnify Sun and Moon.
04:14 By default these check-boxes are checked.
04:18 These check-boxes are used to show the names of sun, moon and other planets.
04:26 Other section represents Deep Sky objects.
04:30 For now we will leave them as default.
04:33 Now click on the OK button in the window.
04:36 We can see some lines and shapes in the sky. They are constellations.
04:41 Let us see what are constellations.
04:45 A constellation is a group of stars which forms an imaginary shape in the night sky.
04:51 In Latin, Stella means a star and constellation means a set of stars.
04:57 Constellations are usually named after mythological characters, people, animals and objects.
05:05 It is like a game of connecting the dots.
05:08 The visible night sky is divided into 88 constellations by astronomers.
05:14 Out of which 12 are zodiac signs.
05:18 For better visibility, I will change the colour of the constellations.
05:23 To open Configure Stars Plugin window, right-click anywhere on the black sky.
05:29 Select Configure option from the context menu.
05:33 Configure Stars Plugin window opens.
05:37 Click on the Lines and Orientation tab.
05:41 Under Constellations, we can see two check-boxes, Lines and Labels.
05:47 Click on the button corresponding to Lines.
05:50 Colour window opens.
05:53 I will select yellow colour from the window.
05:%7 Click on the OK button in the window.
06:00 Next click on the button corresponding to Labels.
06:04 From the colour window I will select red colour.
06:08 Click on the OK button in the color window.
06:11 Below Labels we can see Names drop-down.
06:15 In the drop-down, Latin Name is selected by default.
06:19 I will leave it as it is.
06:22 Next is the Coordinate Grid section.
06:25 Under the Coordinate Grid, we see Celestial Equator, Celestial Poles and Ecliptic check-boxes.
06:33 I will leave them as default.
06:36 Now let us make the stars visible on the interface.
06:40 Click on the Celestial Objects tab.
06:43 Under Star Magnitude Limit , drag the slider to 7 magnitude.
06:48 Now click on the OK button in the window.
06:51 We can see the changes in the Lines and Labels of each constellation.
06:56 Rotate the globe to see the various zodiac signs.
07:04 Let us summarise.
07:06 In this tutorial we have learnt about

Celestial bodies, Stars and constellations, Configure the settings of stars and constellations

07:17 As an assignment

Explore more about Coordinate Grid option.

07:22 Hint: Use Celestial Objects tab in Stars plugin.
07:27 The video at the following link summarizes the Spoken Tutorial project.

Please download and watch it.

07:34 The Spoken Tutorial Project team: conducts workshops using spoken tutorials and gives certificates.

For more details, please write to us.

07:43 Please post your timed queries in this forum.
07:47 Spoken Tutorial Project is funded by, MHRD, Government of India.
07:52 This tutorial is contributed by Viji Nair and Madhuri Ganapathi from IIT Bombay. Thank you for watching.

Contributors and Content Editors

PoojaMoolya