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Sol (borrowed from the Latin word for sun) is a solar day on Mars; that is, a Mars-day. A sol is the apparent interval between two successive returns of the Sun to the same meridian (sundial time) as seen by an observer on Mars. It is one of several units for timekeeping on Mars. A sol is slightly longer than an Earth day.
The pattern of seven-day weeks repeats over a two-year cycle, i.e., the calendar year always begins on a Sunday in odd-numbered years, thus effecting a perpetual calendar for Mars. [27] Whereas previous proposals for a Martian calendar had not included an epoch, American astronomer I. M. Levitt developed a more complete system in 1954.
The basic time periods from which the calendar is constructed are the Martian solar day (sometimes called a sol) and the Martian vernal equinox year.The sol is 39 minutes 35.244 seconds longer than the Terrestrial solar day, and the Martian vernal equinox year is 668.5907 sols in length (which corresponds to 686.9711 days on Earth).
This category is for images of book covers for works by American science fiction writer Robert A. Heinlein. Media in category "Robert A. Heinlein book cover images" The following 51 files are in this category, out of 51 total.
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The Martian setting is logically constructed and rich in convincing detail [while] the characters are engaging and the action develops naturally." [1] P. Schuyler Miller, reviewing the original edition, praised the novel's "verisimilitude, the attention to detail which Heinlein's adult readers know well. . . . the explanations are never dragged ...
These Father's Day in heaven quotes do a good job at helping you reminisce. Taking a look back at the strong bond Ladd Drummond shared with his late father, ...
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