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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 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 suggested that a calendar based on the sol and the Martian year might be a useful timekeeping system for astronomers in the short term and for explorers in the future. For most day-to-day activities on Earth, people do not use Julian days, as astronomers do, but the Gregorian calendar, which despite its various complications is quite ...
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]
While Spirit became immobile in 2009, and ceased communications in 2010, Opportunity exceeded its planned 90 sol (Martian days) duration of activity by 14 years 46 days (in Earth time). Opportunity continued to move, gather scientific observations, and report back to Earth until 2018. What follows is a summary of events during its continuing ...
The Valley of Dor, the River Iss and the Sea of Korus were all key locations in the Martian conception of heaven or the afterlife, which Burroughs had introduced in A Princess of Mars. Metcalf, who thought the appeal of these mystical locations might be strong for readers of the previous tale, suggested that John Carter could arrive from Earth ...
Remembering the fathers in heaven (or wherever you may believe they go after they pass) is important all the time—but especially on Father's Day! Some of the Father's Day quotes you'll read here ...
The Complaint of Mars, [1] is one of Geoffrey Chaucer's short poems that has elicited a variety of critical commentary. While this poem has been seen as allegorical, astronomical, and interpretive-appreciative in nature, a number of critics have examined the poem only as a description of an astronomical event. [2]