11/1/2023 0 Comments Earth moon viewer![]() Tiny crescents depict quasi-stable points utilized for satellites ( b) Quadrant of the lunar orbit showing a to scale comparison of the nearly circular barycenter orbit (solid line) to the Moon’s sinuous orbit (pink dots), which reaches a maximum of ~405,000 km from Earth (e.g., ). Large crescents depict stable orbital positions at the 60° and antipodal Lagrangian points. To paraphrase the NASA video below, think of the reddish hue of the eclipsed moon as the light of every sunrise and sunset occurring on Earth at that moment - the little bits of the sun's glow that are seeping around the edge of Earth's obstructive disc and making their way to the moon.Key features of the 3-body Earth-Moon-Sun system: ( a) Schematic of stable 3-body orbits around the stationary Sun in a plane fixed in space. This happens because our planet doesn't exactly block all the sun's light from reaching the moon and being reflected back to us. (It'll also be visible from South America.) An hour later, the moon should be fully in the umbral shadow of Earth, which projects a reddish glow on to our lone satellite. The eclipse will begin Monday night at 11 p.m. In the past, though, we've gone as long as three centuries with no tetrads, so it's a good time to be an eclipse fan. This will be one of just nine tetrads to occur in the 21st century. This grouping is called a tetrad, and it's a particularly rare tetrad because there's a good chance that all four events will be visible from most locations in the United States, according to NASA. This week's full-blown eclipse is just one of four we'll see in the coming months - the night will also appear to swallow the moon on October 8 of this year and April 4 and September 28 of 2015.
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