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| Transit of Venus from Mars ： ウィキペディア英語版 |
Transit of Venus from Mars
A transit of Venus across the Sun as seen from Mars takes place when the planet Venus passes directly between the Sun and Mars, obscuring a small part of the Sun's disc for an observer on Mars. During a transit, Venus could be seen from Mars as a small black disc moving across the face of the Sun.
==Frequency of occurrence==
No one has ever seen a transit of Venus from Mars, but the next one will take place on August 19, 2030, and could be observed by space probes or hypothetical Mars colonists. Transits of Venus from Mars occur much more often than transits of Earth from Mars, and also much more often than transits of Venus from Earth.
The Venus-Mars synodic period is 333.92 days. It can be calculated using the formula 1/(1/P-1/Q), where P is the orbital period of Venus (224.701 days) and Q is the orbital period of Mars (686.98 days).
The inclination of Venus' orbit with respect to Mars' ecliptic is 1.94°, which is less than its value of 3.39° with respect to Earth's ecliptic.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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