By the way this is an introduction astronomy class. Card # Front of Card Back of
ID: 289532 • Letter: B
Question
By the way this is an introduction astronomy class.
Card # Front of Card Back of Card Sidereal year vs. Calendar year Explain, including leap year. 2 Sidereal day vs. Solar day Sketch it? Explain. How long does each take? Sidereal Month vs. Phase cycle Explain. How long does each take? Wanderers in the Zodiac Why are Sun, Moon and planets only seen in front of the zodiac regions? Why does Earth have seasons? What is NOT the reason? What two things happen because of tilt? Tilt toward Sun Do we catch more or fewer rays? Is the light more or less concentrated? 7What days are aphelion,Sketch it 8 | How much of Moon is always lit? | Look atyour sketch! 9 What do we call the side of Moon Hint: is it close or far? 10 What phase rises in the morning Visualize or draw the picture! perihelion, and the solstices? What side is lit? we see? and sets after sunset? Which way does Earth spin? Solar eclipse Lunar eclipse What cardinal direction? Summarize 12 Summarize 13 14 Where,in your sky, is Moon when Is it high up or low on your horizon? it is low tide? Spring tides vs, Neap tides Explain. What phases? Sketch Is there one side of Moon that Write this answe stays dark? Is there one side we 16 never see from Earh? 17 Does Moon spin? How long? Synchronous orbit: what does that 18 Is the side of Moon near us always mean? What's the reason for this? Did this happen right away or take a while?
Explanation / Answer
4. The signs of the Zodiac come from the constellations through which the sun passes. They are the constellations which lie in Earth's orbital plane. Though the moon circles Earth roughly once a month, eclipses don't happen nearly that frequently because the moon's orbit is slightly tilted relative to that of our planet.
8.During the crescent phases the percent illuminated is between 0 and 50% and during gibbous phases it is between 50% and 100%.At new moon, the Moon is lined up between the Earth and the Sun.
We see the side of the Moon that is not being lit by the Sun (in other words, we see no Moon at all, because the brightness of the Sun outshines the dim Moon!) When the Moon is exactly lined up with the Sun (as viewed from Earth), we experience an eclipse.As the Moon moves eastward away from the Sun in the sky, we see a bit more of the sunlit side of the Moon each night.
16. There is no dark side of the moon, any more than there is a dark side of the earth.The dark side of Earth (night) changes as the earth rotates in the sun’s light. Likewise, the dark face of the moon (lunar night) changes as the moon rotates in the sun’s light. The fact that the same physical half of the Moon, the near side, is always facing Earth, which in turn means that there is a far side or so-called dark side that is never facing Earth and can only be seen from space.
Because the moon is tidally locked with Earth, it rotates at the same speed it orbits us. So while we rotate once every 24 hours, the moon rotates once every 28 days. It always presents the same face to us, but it does not always present its daylight face to us. Walk outside and find the moon (it may be out during the day or night) and there is only a 1 in 28 chance that it is full. On all other days, we can see its terminator—we can see part of its day and part of its night. The fraction of its earth-facing side that is in daylight cycles in an every repeating pattern as it orbits us, and is called the phase of the moon.
17.The Moon does rotate. If you stood on the Moon, the stars would rise and set, just like they do on Earth, except that a lunar day is a month long, the same as the Moon's orbital period.
A synchronous orbit is an orbit in which an orbiting body (usually a satellite) has a period equal to the average rotational period of the body being orbited (usually a planet), and in the same direction of rotation as that body.
18. The moon is not stuck in place with one side facing us. Our lunar companion rotates while it orbits Earth. It’s just that the amount of time it takes the moon to complete a revolution on its axis is the same it takes to circle our planet — about 27 days. As a result, the same lunar hemisphere always faces Earth.
The moon’s gravity slightly warps our planet’s shape and gives us tides. Likewise, Earth tugs at the moon, creating a rocky, high-tide bulge facing us. That bulge ended up working like a brake, slowing the moon’s spin down to the current rate, so the lunar high tide permanently faces us. When that happened, about 4 billion years ago, the moon became tidally locked, and it has presented us the same visage ever since.
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