Date Of Winter Solstice 2024. In the illustration above, the angular distance on the sky at the meridian between the celestial equator (the projection of the earth’s equator onto the sky) and the ecliptic (the plane of the solar system) is exactly equal. It marks the start of winter in some countries and calendars.
In the illustration above, the angular distance on the sky at the meridian between the celestial equator (the projection of the earth’s equator onto the sky) and the ecliptic (the plane of the solar system) is exactly equal. This event marks the longest night and the shortest day of the year.