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  2. Solar cycle 25 - Wikipedia

    en.wikipedia.org/wiki/Solar_cycle_25

    Year 3 of SC25 (Dec 2021 to Nov 2022) averaged 8% more spots per day than year 3 of SC24. Year 4 of SC25 (Dec 2022 to Nov 2023) averaged 41% more spots per day than year 4 of SC24. Year 5 of SC25 (Dec 1, 2023 to Oct 13, 2024) is currently averaging 81% more spots per day than the corresponding period of SC24.

  3. Solar calendar - Wikipedia

    en.wikipedia.org/wiki/Solar_calendar

    A calendar of this type is called a sidereal solar calendar. [2] The mean calendar year of such a calendar approximates the sidereal year. Leaping from one lunation to another, but one Sidereal year is the period between two occurrences of the sun, as measured by the stars' solar calendar, which is derived from the Earth's orbit around the sun ...

  4. Tropical year - Wikipedia

    en.wikipedia.org/wiki/Tropical_year

    While the Sun moves, ♈︎ moves in the opposite direction. When the Sun and ♈︎ met at the 2010 March equinox, the Sun had moved east 359°59'09" while ♈︎ had moved west 51" for a total of 360° (all with respect to ♈︎ 0 [29]). This is why the tropical year is 20 min. shorter than the sidereal year.

  5. Solar New Year - Wikipedia

    en.wikipedia.org/wiki/Solar_New_Year

    The Solar New Year is the beginning of the solar calendar year. This event is observed at different times of year and with varying practices in cultures across the globe. The most common bases chosen to begin a new calendar year are the winter solstice, summer solstice, the spring equinox and the autumnal equinox. South and South-east Asian ...

  6. September equinox - Wikipedia

    en.wikipedia.org/wiki/September_equinox

    The September equinox (or southward equinox) is the moment when the Sun appears to cross the celestial equator, heading southward. Because of differences between the calendar year and the tropical year, the September equinox may occur from September 21 to 24. At the equinox, the Sun as viewed from the equator rises due east and sets due west ...

  7. Solar cycle 22 - Wikipedia

    en.wikipedia.org/wiki/Solar_cycle_22

    The maximum smoothed sunspot number observed during the solar cycle was 212.5 (November 1989), and the starting minimum was 13.5. [3] During the minimum transit from solar cycle 22 to 23, there were a total of 309 days with no sunspots. [4] [5] [6]

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  9. Saros (astronomy) - Wikipedia

    en.wikipedia.org/wiki/Saros_(astronomy)

    The saros (/ ˈ s ɛər ɒ s / ⓘ) is a period of exactly 223 synodic months, approximately 6585.321 days (18.04 years), or 18 years plus 10, 11, or 12 days (depending on the number of leap years), and 8 hours, that can be used to predict eclipses of the Sun and Moon.

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