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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 average length of a Martian sidereal day is 24 h 37 m 22.663 s (88,642.663 seconds based on SI units), and the length of its solar day is 24 h 39 m 35.244 s (88,775.244 seconds). [3]
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).
Mars's average distance from the Sun is roughly 230 million km (143 million mi), and its orbital period is 687 (Earth) days. The solar day (or sol) on Mars is only slightly longer than an Earth day: 24 hours, 39 minutes, and 35.244 seconds. [185] A Martian year is equal to 1.8809 Earth years, or 1 year, 320 days, and 18.2 hours. [2]
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.
The temperature variations between spring and summer are much less than the very sharp variations that occur within a single Martian sol (solar day). On a daily basis, temperatures peak at local solar noon and reach a minimum at local midnight. This is similar to the effect in Earth's deserts, only much more pronounced.
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 ...
One design consideration is the amount of solar power available over the course of a Martian day, and another is the battery storage capacity and the efficiency and weight of the solar cells. [6] One reason for a small size was to facilitate its transport to planet Mars from Earth. [7]