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This can only happen if the moonrise at a certain date is earlier than the moonrise at the previous day. There are two reasons why this could happen: The body (Moon, Mars,...) moves in the opposite direction of the Sun viewed along the right ascension (or elliptical longitude) axis. The sidereal day is 4 minutes shorter than 24 hours which means that a ...


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You can calculate the angular diameter of the Earth using the equation: $$a = \arctan \frac{D}{d}$$ where $a$ is the angular diameter, $D$ is the physical diameter of the Earth, and $d$ is the distance from the Moon to the Earth. The equatorial radius of the Earth is $r_E = 6378.1 \textrm{km}$, the diameter is therefore $D= 2 \times r_E = 12756.2$. The ...


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The average angular diameter of the Moon, as seen from the Earth, is about 31 arcminutes. The angular diameter depends on the distance between the two objects and the diameter of the object being viewed. Specifically, for small angles, it is the diameter divided by the distance. When the distance is the same, the angular size is proportional to the ...



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