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The first day of each month is shown in black, and the solstices and equinoxes are shown in green. It can be seen that the equinoxes occur approximately at altitude φ = 90° − 51.5° = 38.5°, and the solstices occur approximately at altitudes φ ± ε where ε is the axial tilt of the Earth, 23.4°.
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The fall equinox, also known as the autumnal equinox, is when astronomical fall arrives. This year, it will occur at 8:44 a.m. EDT on Sept. 22, according to the Naval Observatory.
Therefore, greater tilt means a lower minimum for the same maximum: less total annual surface insolation at the equator. At the poles (90° latitude), on the equinoxes and during polar night, the sun angle is always 0° or less no matter the axial tilt, while on the summer solstice, the maximum angle is equal to the tilt. Therefore, greater ...
The 2024 winter solstice, the shortest day of the year, happens on Saturday, Dec. 21, in the Northern Hemisphere. The celestial event signifies the first day of winter, astronomically.
The solstices, together with the equinoxes, are connected with the seasons. In some languages they are considered to start or separate the seasons; in others they are considered to be centre points (in England , in the Northern Hemisphere, for example, the period around the northern solstice is known as midsummer).
The length of each season and when each solstice and equinox occurs depend on the planet’s tilt. For instance, Uranus is tilted by 82 degrees, so it deals with seasons that last two decades.
Solstices and equinoxes, Sun cross: Date: 8 March 2007: Source: SVG version of Image:Solstices and equinoxes.ant.png, original image by Ant Allan is under GFDL: Author: slady: Other versions: Image:Solstices and equinoxes.ant.png, and if the white background is not suitable for your purposes – Image:Solstices and equinoxes seethru.svg: SVG ...