You are well aware of what the Arctic Circle is on Earth and how it relates to the seasonal movement of the Sun. There is a similar “Arctic Circle” on the globe and for the Moon. Find the latitude of the “Lunar Polar Circle” for the northern hemisphere of the Earth, if the inclination of the Moon’s orbital plane to the plane of the ecliptic is 5.1 °.
Unlike the “solar” polar circle, the “lunar” polar circle will not maintain a constant position on the Earth’s surface. After all, the lunar orbit, like a child’s whirligig, precesses in space, and the maximum angular distance of the Moon from the celestial equator changes from 18.4 ° to 28.6 ° with a period of 18.6 years. Accordingly, the latitude of the lunar polar circle will vary from 71.6 ° to 61.4 ° with the same period.
We must not forget that the latitude of the polar circle for the non-setting and non-rising moon will differ due to the phenomenon of parallax, which reduces the apparent height of the moon at the horizon. In absolute value, this effect is greater than atmospheric refraction, which, on the contrary, “lifts” all the stars, including the Moon.
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