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An observer on Mars would be able to see the Moon orbiting around the Earth, and this would easily be visible to the [[naked eye]]. By contrast, observers on Earth cannot see any other planet's satellites with the naked eye, and it was not until soon after the invention of the telescope that the first such satellites were discovered ([[Jupiter]]'s [[Galilean moons]]). |
An observer on Mars would be able to see the Moon orbiting around the Earth, and this would easily be visible to the [[naked eye]]. By contrast, observers on Earth cannot see any other planet's satellites with the naked eye, and it was not until soon after the invention of the telescope that the first such satellites were discovered ([[Jupiter]]'s [[Galilean moons]]). |
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[[Image:PIA05547-Spirit Rover-Earth seen from Mars.png|thumb|right|200px|Earth as morning star, imaged by [[Spirit rover|MER ''Spirit'']] on March 7, 2004]] |
[[Image:PIA05547-Spirit Rover-Earth seen from Mars.png|thumb|right|200px|Earth as morning star, imaged by [[Spirit rover|MER ''Spirit'']] on March 7, 2004]] |
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At maximum angular separation, the Earth and Moon would be easily distinguished as a double planet, but about one week later they would merge into a single point of light (to the naked eye), and then about a week after that, the Moon would reach maximum angular separation on the opposite side. The maximum angular separation of the Earth and Moon varies considerably according to the relative distance between the Earth and Mars: it is about |
At maximum angular separation, the Earth and Moon would be easily distinguished as a double planet, but about one week later they would merge into a single point of light (to the naked eye), and then about a week after that, the Moon would reach maximum angular separation on the opposite side. The maximum angular separation of the Earth and Moon varies considerably according to the relative distance between the Earth and Mars: it is about 17′ when Earth is closest to Mars (near [[inferior conjunction]]) but only about 3.5′ when the Earth is farthest from Mars (near [[superior conjunction]]). For comparison, the apparent diameter of the Moon from Earth is 31′. |
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[[Image:Earth and Moon from Mars PIA04531.jpg|thumb|left|200px|Earth and Moon from Mars, imaged by [[Mars Global Surveyor]] on May 8, 2003, 13:00 [[UTC]]. South America is visible.]] |
[[Image:Earth and Moon from Mars PIA04531.jpg|thumb|left|200px|Earth and Moon from Mars, imaged by [[Mars Global Surveyor]] on May 8, 2003, 13:00 [[UTC]]. South America is visible.]] |
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The minimum angular separation would be less than 1′, and occasionally the Moon would be seen to [[astronomical transit|transit]] in front of or pass behind (be occulted by) the Earth. The former case would correspond to a lunar [[occultation]] of Mars as seen from Earth, and because the Moon's [[albedo]] is considerably less than that of the Earth, a dip in overall brightness would occur, although this would be too small to be noticeable by casual naked eye observers because the size of the Moon is much smaller than that of the Earth and it would cover only a small fraction of the Earth's disk. |
The minimum angular separation would be less than 1′, and occasionally the Moon would be seen to [[astronomical transit|transit]] in front of or pass behind (be occulted by) the Earth. The former case would correspond to a lunar [[occultation]] of Mars as seen from Earth, and because the Moon's [[albedo]] is considerably less than that of the Earth, a dip in overall brightness would occur, although this would be too small to be noticeable by casual naked eye observers because the size of the Moon is much smaller than that of the Earth and it would cover only a small fraction of the Earth's disk. |
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Greek: Ά ά Έ έ Ή ή Ί ί Ό ό Ύ ύ Ώ ώ Α α Β β Γ γ Δ δ Ε ε Ζ ζ Η η Θ θ Ι ι Κ κ Λ λ Μ μ Ν ν Ξ ξ Ο ο Π π Ρ ρ Σ σ ς Τ τ Υ υ Φ φ Χ χ Ψ ψ Ω ω {{Polytonic|}}
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