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Perseverance is timed for a launch opportunity between July 30 - Aug. 15, 2020 when Earth and Mars are in good positions relative to each other for landing on Mars. That is, it takes less power to travel to Mars at this time, compared to other times when Earth and Mars are in different positions in their orbits.
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During 2020, this occurs in mid-August. The spectacular appearance of a bright star in the morning before sunrise is an impressive sight. ... The first morning appearance of a star in the eastern sky before sunrise is known as the “heliacal rising” of the star. The first morning appearance of Sirius attracts attention.May 25, 2020
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