Marble/C3/Satellites-and-Eclipses/English-timed

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Time
Narration
00:01 Welcome to this Spoken Tutorial on Satellites and Eclipses.
00:06 In this tutorial we will learn about,
00:09 Satellites
00:11 Eclipses
00:13 Configure satellites and eclipses
00:17 To record this tutorial, I am using, Ubuntu Linux OS, version 16.04
00:25 Marble version 1.12.20 and
00:30 A working Internet connection.
00:32 The process demonstrated in this tutorial is identical in,

Ubuntu Linux OS, version 18.04, Marble version 2.2.20

00:47 To practise this tutorial, learner should be familiar with Marble interface.
00:53 For the prerequisite Marble tutorials, please visit this site.
00:58 We will begin with satellites.
01:01 A satellite is an object in space that orbits around a bigger object.
01:07 An orbit is a regular, repeating path that an object takes around another object.
01:14 I have opened the Marble interface in the default Atlas view.
01:19 I will hide overview map, compass and scale bar plugins.
01:26 I will drag and place the windrose at a convenient location.
01:32 I will disable the view of stars for clarity.
01:36 Go to View menu and click on Stars option.
01:40 Again go to View menu and select Online Services.
01:45 From the sub-menu select Satellites option.
01:49 Observe that a number of satellites appear on the interface.
01:54 Satellites will appear only if you are connected to the internet.
01:59 Let us rotate the globe to see different satellites.
02:03 Each satellite has pivoted on the globe based on its coordinates.
02:08 I will locate one of the satellites and click on it.
02:12 You may locate any one of the satellites.
02:16 A context menu opens.
02:19 From the context menu select the name of the satellite.
02:23 Satellite information sheet opens.
02:27 The satellite’s name and NORAD ID are shown at the top of the sheet.
02:33 Next we have Coordinates table.
02:36 This table shows information about Longitude, Latitude and Altitude of the satellite.
02:47 Information sheet has a scroll-bar to scroll to the bottom of the sheet.
02:53 Below the table Geometry of a satellite orbit is shown.
02:59 Next we have Orbital Data.
03:02 It shows Perigee, Apogee, Inclination, Period and Semi major axis.
03:15 Let us close this information sheet.
03:19 Again click on the satellite.
03:22 From the context menu select Display orbit option.
03:27 Orbit of the satellite appears on the globe.
03:31 I will rotate the globe to show the orbit.
03:40 Now let us hide the orbit.
03:43 Again click on the satellite.
03:46 From the context menu un-check Display orbit option.
03:51 Let us mark the location of the satellite.
03:55 Click on the satellite.
03:57 From the context menu select Keep centred option.
04:02 Position of the satellite is shown by a position tracking arrow.
04:07 To disable the position tracking, click on Location panel.
04:12 In the panel, click on the drop-down button below Position Tracking.
04:17 Select Disabled option.
04:22 Now we will find a particular satellite, Insat 3D.
04:27 Go to the Search panel.
04:30 Type Insat 3D in the search box and press Enter.
04:35 Notice that a cross hair appears on the location of Insat 3D on the globe.
04:42 As an assignment,

Explore more about different satellites of the Earth.

04:49 Let us disable all the satellites.
04:53 Go to View menu and select Online Services option.
04:59 From the sub menu click on Satellites option.
05:03 All satellites have disappeared from the interface.
05:07 Now let's configure satellites plugin.
05:11 Go to Settings menu and click on Configure Marble Virtual Globe option.
05:17 Configure window opens.
05:20 From the window, select Plugins tab.
05:24 Let us scroll down to the bottom and locate Satellites plugin.
05:29 Click on theConfigure button corresponding to Satellites plugin.
05:34 Satellites Configuration Marble –Marble Virtual Globe window opens.
05:40 Click on theActivate Plugin button in the window.
05:44 Satellites Configuration is activated.
5:48 This window has two tabs.

Satellites and Data sources.

05:54 Satellites tab has opened by default.
05:58 Under Earth we have different sections and sub-sections.
06:03 Notice that all the satellites are selected by default.
06:08 I will click on Reset button available at the bottom left corner of the window.
06:14 This will un-check all the satellite check-boxes except the 100(or so) Brightest.
06:21 Click on theOK in the window.
06:24 Click on theOK button in the Configure window.
06:28 Observe that you will see only the 100(or so) Brightest satellites.
06:34 Now we see the satellites of Mars.
06:38 Go to File menu and select Download Maps.
06:42 Marble- Install Maps – Marble Virtual Globe dialog box opens.

Scroll down the box.

06:51 Select Mars Topography.
06:54 Click on Install button to install it.
06:59 Click on Close to the close the dialog box.
07:03 Go to the Map View panel.
07:06 Click on Earth drop-down button and select Mars.
07:11 We can see the satellites of Mars.
07:15 I will rotate the globe to see the satellites of Mars.
07:30 As an assignment,

Download Venus Topography map

07:35 Find the Venus Express satellite of Venus
07:39 Open its information data sheet
07:43 Display its orbit and Track its position
07:50 Go to Mapview panel, click on the Mars drop-down button and select Earth.
07:56 Let us disable the satellites.
07:59 Go to View menu and select Online services. From the sub menu select Satellites option.
08:07 Now let us learn about Eclipses.
08:11 An eclipse occurs, when an astronomical object or spacecraft is temporarily obscured, by passing into the shadow of another object.
08:21 Let us now see the eclipses formed in various parts of the world.
08:26 Go to View menu and select Eclipses.
08:30 Again Go to View menu and select Browse Eclipses.
08:35 Eclipse Browser – Marble Virtual Globe window opens.
08:40 Window has a table with the following columns.

Start, End, Type and Magnitude.

08:49 Drag the column separator to see the information clearly.
08:55 Observe that only solar eclipses for the year are shown in the table.
09:01 Show eclipses for year: text box, has a plus and minus button.
09:07 By default year 2020 is shown.
09:11 Click on the button to see eclipses in the corresponding years.
09:17 Table shows two solar eclipses that occurred in the year 2020.
09:24 Select the first eclipse and click on Go To Selected Eclipse button.
09:31 The places of the world where eclipse was seen are shown as shaded parts.
09:37 Similarly we can see the second eclipse.
09:41 Go to View menu and select Browse Eclipses.
09:46 In the window select 2nd eclipse and click on Go To Selected Eclipse button.
09:53 Here we can see the shaded parts where eclipse was seen.
09:58 To hide the shaded parts click on View menu and select Eclipses.
10:04 Again go toView menu and selectBrowse Eclipses.
10:09 Click onSettings button at the top right corner of the window
10:14 Eclipses Configuration window opens.
10:18 Window has View and Remainder tabs.
10:22 View tab is selected by default.
10:25 In the View Options section, click on Enable Lunar Eclipses check-box.
10:31 Leave the other check-boxes as default.
10:35 Click on OK button.
10:38 Observe that of lunar eclipses are added to the table.
10:43 In this version of Marble only solar eclipses can be shown as shaded regions.
10:50 As an assignment,

Using Show eclipses for year: text box change the years to 2018 and 2019.

11:00 Observe the solar eclipses in these years.
11:04 Let us summarize.
11:07 In this tutorial we have, learnt about, Satellites, Eclipses, Configure satellites and eclipses
11:16 The video at the following link summarizes the Spoken Tutorial project.

Please download and watch it.

11:23 TheSpoken Tutorial Project team: conducts workshops and gives certificates.

For more details, please write to us.

11:32 Please post your timed queries in this forum.
11:36 Spoken Tutorial Project is funded by, MHRD, Government of India.
11:42 This tutorial is contributed by Viji Nair and Madhuri Ganapathi from IIT Bombay.

Thank you for watching.

Contributors and Content Editors

PoojaMoolya