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Solar calendar - Wikipedia, the free encyclopedia
A solar calendar is a calendar whose dates indicate the position of the earth on its revolution around the sun (or equivalently the apparent position of the sun moving on the celestial sphere). If t...
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Iranian calendar - Wikipedia, the free encyclopedia
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Thai solar calendar - Wikipedia, the free encyclopedia
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The solar calendar is based on the regular seasonal changes the earth undergoes in its yearly orbit around the sun. Over the years this system has underwent revision.
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Adding 7 months every 19 years approximates the solar year with 235 lunar months. That is mathematically (by continued fractions) the most accurate convenient cycle for a luni-solar calendar and would give, using the mean value of the synodic month (29.530588 days), a year of 365.2467463 days long.
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Solar Observing ... Solar Filters ... Lunar / Solar Calendar - scopecity.net...
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