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Question For astronomers: Can you explain the moons cycle of dark,1/4, 1/2, full?
I know this will take a long answer, but I couldn't figure it out.
Ok the Earth revolves around the sun= 1 year right?
(I think the north pole is always tilted toward the sun?)
The Earth rotates on it's axis= 1day right?
I don't know the lunar cycle , but 2 weeks ago we had a 1/4 moon in the southern sky and the sun sets in the west. What causes the circular darkness on the moon?
Last night we had a 1/2 moon in the southern sky in about the same location as the 1/4 moon was.
It had an almost perfect straight line of darkness, causing me to wonder that the Earth must not be casting this shadow? The sun still in the west, the moon in the south. what is causing the shadow causing the 1/4 and 1/2 moon?
I have a basic understanding of the sky, so please explain it to me in a language I can understand.
Thanks
i am trying to answer your questions in the order presented.
earth around sun - 1 year
the earth is tilted, but which pole points more towards the sun depends on our position in the rotation. take a cup or some other random object from your desk put it in the middle of the desk - this is the sun. take a pen, hold one end, touch the other end to the desk, tilt it at 45 degrees - this is the earth. now circle the cup. keep the tilt the same way all of the time. see how on one side the of the circle the top of the pen (north pole) is closest to the sun (for right handers this is typically the left side of the circle), while on the opposite side of the circle the bottom of the pen (south pole) is closest.
the earth spins once daily
the earth's shadow does NOT cause the dark spot (cycles) on the moon. the light part is lit from the sun's rays, the dark part is because without the sun it is dark.
the moon travels in a line across the sky, so you seeing it in the southern sky is roughly given, it doesn't divert all over the sky. it sticks to its line. the TIME you saw the moon at that point varies by where it is in it's cycle. Wikipedia shows this, but the picture is hard to understand. so you saw the moon in roughly the same place but it was a different point in the cycle, because you saw it at a different time of day (night).
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