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In contrast, the Lunar distance (LD or ), or Earth–Moon characteristic distance, is a unit of measure in astronomy. More technically, it is the semi-major axis of the geocentric lunar orbit . The lunar distance is on average approximately 385,000 km (239,000 mi), or 1.28 light-seconds ; this is roughly 30 times Earth's diameter or 9.5 times ...
In celestial navigation, lunar distance, also called a lunar, is the angular distance between the Moon and another celestial body. The lunar distances method uses this angle and a nautical almanac to calculate Greenwich time if so desired, or by extension any other time. That calculated time can be used in solving a spherical triangle.
Mars comes closer to Earth more than any other planet save Venus at its nearest—56 million km is the closest distance between Mars and Earth, whereas the closest Venus comes to Earth is 40 million km. Mars comes closest to Earth every other year, around the time of its opposition, when Earth is sweeping between the Sun and Mars. Extra-close ...
Deimos (/ ˈ d aɪ m ə s /; systematic designation: Mars II) [11] is the smaller and outer of the two natural satellites of Mars, the other being Phobos. Deimos has a mean radius of 6.2 km (3.9 mi) and takes 30.3 hours to orbit Mars. [5] Deimos is 23,460 km (14,580 mi) from Mars, much farther than Mars's other moon, Phobos. [12]
Launching a rover into space and landing it safely on an alien surface is difficult enough. Then you have to get the thing to actually drive.Humans put seven rovers on the moon and six on Mars ...
Equivalent distance in Example Meters Kilometers Miles light-second 1 light-second 299 792 458 m: 2.998 × 10 5 km: 1.863 × 10 5 miles: Average distance from the Earth to the Moon is about 1.282 light-seconds light-minute 60 light-seconds = 1 light-minute 17 987 547 480 m: 1.799 × 10 7 km: 1.118 × 10 7 miles
2020 LD is an Apollo near-Earth asteroid roughly 140 meters ... and Mars. [2] It will be brighter ... that passed inside 1 lunar distance from Dec 2011 – June 2020 ...
Separation distance Typical phase duration Drift Orbit A (out of sight, out of contact) >2 λ max [note 1] 1 to 20 days Drift Orbit B (in sight, in contact) 2 λ max to 1 kilometer (3,300 ft) 1 to 5 days Proximity Operations A: 1,000–100 meters (3,280–330 ft) 1 to 5 orbits Proximity Operations B: 100–10 meters (328–33 ft) 45 – 90 ...