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2020 June 21 at 09:35:13.9 UTC June 21, 2020 Solar Eclipse Parameters ... Sun Declination +23°26'09.7" Sun Semi-Diameter 15'44.2" Sun Equatorial Horizontal Parallax ...
2020 20: 03:50: 20: 21:43: 22: 13:31: 21: 10:03 2021 20: ... because at the solstices, the Sun's declination appears to ... (around 21 June) and ends when the Sun ...
A line graph of the Sun's declination during a year resembles a sine wave with an amplitude of 23.44°, but one lobe of the wave is several days longer than the other, among other differences. The following phenomena would occur if Earth were a perfect sphere , in a circular orbit around the Sun, and if its axis were tilted 90°, so that the ...
In the Northern Hemisphere, this is the June solstice (20, 21 or 22 June) and in the Southern Hemisphere, this is the December solstice (20, 21, 22 or 23 of December). Since prehistory, the summer solstice has been a significant time of year in many cultures, and has been marked by festivals and rituals.
Analemma: Equation of time vs. declination of the Sun. Calculated for the year 2020 using the formulas from The Astronomical Almanac for the Year 2019. As often seen on a globe, the analemma is also often plotted as a two-dimensional figure of equation of time vs. declination of the Sun.
As at Dec 6, 2024, solar cycle 25 is averaging 39% more spots per day than solar cycle 24 at the same point in the cycle (Dec 6, 2013). Year 1 of SC25 (Dec 2019 to Nov 2020) averaged 101% more spots per day than year 1 of SC24.
It is the complement to the solar altitude or solar elevation, which is the altitude angle or elevation angle between the sun’s rays and a horizontal plane. [1] [2] At solar noon, the zenith angle is at a minimum and is equal to latitude minus solar declination angle. This is the basis by which ancient mariners navigated the oceans. [3]
The French First Republic was proclaimed and the French monarchy was abolished on September 21, 1792, making the following day (the equinox day that year) the first day of the "Republican Era" in France. The start of every year was to be determined by astronomical calculations following the real Sun and not the mean Sun.