![]() Also, it's harder to track when the moon rises during daylight hours. You just have to pay much closer attention to the moonrise and moonset relationship because of the 50-minute time difference. So, it only seems like there is no pattern to the Earth-moon relationship. The sun rises and sets one minute later for each 12 1/2 miles westward of Bismarck and one minute earlier for each 12 1/2 miles eastward of. The moon rises 50 minutes later each day. So, the moon goes through the 29.6 degrees north or south of due east and west much faster. So, here is the kicker: remember how it takes 365 days for the Earth to revolve around the sun? Well, it only takes the moon about 28.5 days (about a month) to rotate around the Earth. We get the 29.6 degrees by adding the Earth's tilt of 23.5 degrees and moon's offset of 5.1 degrees. So, the moonrise and moonset is 29.6 degrees north or south of due east and west. The moon's orbital plane is similar to the Earth's orbital plane around the sun, but it is offset by about 5.1 degrees. That means the sun rises and sets within a difference of a few seconds to three minutes each days. It take the Earth 365.25 days to move between those 23.5 degrees. Because of this, the sun rises and sets within 23.5 degrees north or south of due east or west. The Earth tilts on its axis at an angle of 23.5 degrees. So, the next question is, why does it seem like the there is no pattern in timing of the moonrise and moonset? Again, we look to the sun for answers. You say that Sun rises in the East (with a certain degree of oscillations due to the tilt of the axis) just because the Earth spins from West to East. Because the sun’s diameter equals 1/2 degree, that means the sun. The Sun does not rise, it is the horizon that goes down. Any planet rotation on its axis from west to east will. Two weeks later, on April 4, the sun rises about 7 degrees north of due east and and sets about 7 degrees north of due west. Around the northern summer solstice and southern winter solstice. The picture below is of the moon setting in the west behind the Sierra Nevada mountains in the morning. The direction of the sunrise depends upon the direction of the rotation of the earth on its axis. When this happens, Dibble Glacier, a peninsula on the Antarctic coastline, gets the first sunrise of the day during the solstice. It is the Earth's rotation on its axis that makes the moon rise in east and set in the west. ![]() ![]() It is the Earth's rotation on its axis that makes the sun rise in the east and set in the west. This is because the Earth rotates on its axis in a counter-clockwise motion, or from west to east. The sun always rises in the east and sets in the west. So let's get back to the question of why the moon seems to always be in a different place in the sky. We all know the sun rises in the east and sets in the west. The other celestial body that we are all used to seeing is the sun. Why is this? Does the moon rise in the east and set in the west? Or is it the opposite? Or perhaps, it treks across the sky from north to south? The moon always rises in the east and sets in the west.It takes 28.5 days for the moon to revolve around the Earth.The moon rises 50 minutes later each day. ![]()
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