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

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.
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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.

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PoojaMoolya