demo.cel

{
	timerate { rate 0 }
	labels { clear "planets|minorplanets|stars|constellations" }
	renderflags { set "stars|planets"
                      clear "constellations|orbits|cloudmaps" }
	print { text "Beginning demo . . .\nPress ESC to end." origin "center" duration 2 }
	wait { duration 2.0 }

	print { text "Let's start near home . . ." row -3 }
	select { object "Sol/Earth" }
	cancel {}
	# goto { time 0 distance 3 upframe "ecliptical" }
	# gotolonglat { time 0 distance 3 longitude -122 latitude 47 }
	synchronous {}
	gotoloc { time 0.0 position [ 0 0 20000 ] }
	wait { duration 0.1 }
	center { time 0.1 }
	wait { duration 1.0 }
	follow {}

	print { text "We're now orbiting about 12,500km above the Earth" row -3 duration 5 }
	orbit { axis [ 0 1 0 ] rate 30 duration 10 }
	print { text "Earth looks much more familiar with clouds." row -3}
	wait { duration 0.1 }
	renderflags { set "cloudmaps" }
	orbit { axis [ 0 1 0 ] rate 30 duration 6 }

	print { text "Next stop: the Moon." row -3 }
	select { object "Moon" }
	goto { time 5 distance 4 upframe "equatorial" }
	wait { duration 5.5 }
	print { text "Watch for the Earth and Sun as we orbit the Moon" row -3}
	orbit { axis [ 0 1 0 ] rate 30 duration 10 }
	
	print { text "Off toward the Sun." row -3}
	select { object "Sol" }
	goto { time 8 distance 12 upframe "equatorial" up [ 0 1 0 ] }
	wait { duration 8.5 }
	print { text "At this distance, dark sunspots are visible on the Sun's surface." row -3}
	orbit { axis [ 0 1 0 ] rate 20 duration 10 }

	print { text "Let's zoom out for an overview of the inner solar system." row -3}
	orbit { axis [ 1 0 0 ] rate 45 duration 2 }
	renderflags { set "orbits" }
	changedistance { duration 4.0 rate 1.0 }
	
	print { text "Turning on planet labels . . ." row -3}
	labels { set "planets" }
	wait { duration 1.0 }
	print { text "We can speed up time to watch the planets orbit the sun." row -3}
	timerate { rate 2592000 }
	wait { duration 3.0 }
	print { text "For each second, a month of time elapses in the simulation." row -3}
	wait { duration 12.0 }
	timerate { rate 1 }
	print { text "Now, time has been stopped completely." row -3}

	wait { duration 1.0 }
	print { text "Our next destination is Saturn." row -3}
	select { object "Saturn" }
	center { time 2 }
	wait { duration 2 }
	goto { time 8 distance 6 up [ 0 1 0 ] upframe "equatorial" }
	wait { duration 6.5 }
	renderflags { clear "orbits" }
	labels { clear "planets" }
	print { text "Several of the moons of Saturn are visible as bright dots" row -3 duration 3}
	orbit { axis [ 0 1 0 ] rate 30 duration 12 }
	
	select { object "Mimas" }
	goto { time 5 distance 4 upframe "equatorial" }
	print { text "The most prominent feature on Saturn's moon Mimas is the huge impact crater Herschel." row -3 duration 9 }
	orbit { axis [ 0 1 0 ] rate 30 duration 12 }
	changedistance { duration 6.0 rate 0.5 }

	select { object "Sol" }
	center { time 2 }
	print { text "Note how faint the Sun appears at this distance." row -3 }
	wait { duration 2 }

	print { text "Let's look around at the stars in the sky." row -3 duration 2 }
	wait { duration 2 }
	select { object "Alpha UMa" }
	center { time 2 }
	print { text "Northern Hemisphere residents should recognize the Big Dipper in the constellation Ursa Major." row -3 duration 3 }
	wait { duration 4 }

	select { object "Polaris" }
	center { time 2 }
	wait { duration 2 }
	print { text "We're now centered on Polaris, the North Star." row -3}
	wait { duration 1 }
	labels { set "stars" }
	wait { duration 2 }
	print { text "Polaris is part of the asterism commonly called the Little Dipper." row -3}
	wait { duration 2 }
	print { text "To help us get oriented in the sky, Celestia can draw constellation diagrams for us . . ." row -3}
	renderflags { set "constellations" }
	wait { duration 2 }
	print { text ". . . and constellation names" row -3}
	labels { set "constellations" }
	wait { duration 2 }

	select { object "Alnilam" }
	center { time 4 }
	wait { duration 2 }
	print { text "Orion is the sky's most prominent constellation." row -3 duration 3 }
	wait { duration 4 }

	select { object "Beta Cru" }
	center { time 4 }
	wait { duration 2 }
	print { text "The Southern Cross is a familiar sight in Southern Hemisphere skies." row -3 duration 4 }
	wait { duration 4 }

	rotate { axis [ 0.707 0.707 0 ] rate 20 duration 7 }
	print { text "Let's enable galaxy rendering so that we can see the Milky Way" row -3 duration 4 }
	renderflags { set "galaxies" }
	rotate { axis [ 0.707 0.707 0 ] rate 20 duration 14 }
	rotate { axis [ 0.707 0.707 0 ] rate 20 duration 10 }

	select { object "Antares" }
	center { time 5 }
	wait { duration 3 }
	print { text "We'll now travel to Antares, a red giant star in Scorpius." row -3 duration 5 }
	wait { duration 2 }
	renderflags { clear "constellations" }
	labels { clear "constellations|stars" }
	wait { duration 1 }
	goto { time 8 distance 200 }
	wait { duration 8.5 }
	goto { time 5 distance 10 }
	wait { duration 5.0 }
	print { text "Even though we are now 10 times farther from Antares than\nEarth is from the Sun, the massive red giant star still looms huge in the sky." row -3}
	wait { duration 4.0 }

	print { text "Let's zoom out and get the big picture . . ." row -3}
	changedistance { duration 10.0 rate 2.0 }

	select { object "Milky Way" }
	print { text "We're viewing the entire Milky Way galaxy." row -3 duration 6 }
	orbit { axis [ 1 0 0 ] rate 30 duration 16.0 }
	print { text "Time to go home . . ." row -3}

	select { object "Sol/Earth" }
	goto { time 20 distance 10 upframe "equatorial" }
	wait { duration 20.0 }
	print { text "Demo completed." row -3}
	wait { duration 3.0 }
}