2025年3月20日
The Solar Eclipse Analemma Project
Image Credit & Copyright: Hunter Wells
Explanation: Recorded from 2024 March 10, to 2025 March 1, this composited series of images reveals a pattern in the seasonal drift of the Sun’s daily motion through planet Earth’s sky. Known to some as an analemma, the figure-eight curve was captured in exposures taken on the indicated dates only at 18:38 UTC from the exact same location south of Stephenville, Texas. The Sun’s position on the 2024 solstice dates of June 20 and December 21 would be at the top and bottom of the curve and correspond to the astronomical beginning of summer and winter in the north. Points that lie along the curve half-way between the solstices would mark the equinoxes. The 2024 equinox on September 22, and in 2025 the equinox on March 20 (today) are the start of northern fall and spring. And since one of the exposures was made on 2024 April 8 from the Stephenville location at 18:38:40 UTC, this analemma project also reveals the solar corona in planet Earth’s sky during a total solar eclipse.
Tomorrow’s picture: pixels in space
带食的日行迹
影像提供与版权: Hunter Wells
说明: 这幅摄于2024年3月10日至2025年3月1日期间的组合影像,呈现了地球天空中的太阳位置如何随季节漂移的图案。这种8字形的图案称为日行迹,而这个拍摄地点在美国德州斯蒂芬维尔镇之南的范例,太阳的位置皆是摄于图上标示日期的18:38 UTC。其中,代表2024年北半球夏季与冬季起点的夏至(6月20日)和冬至(12月21日),分别位于日行迹的顶端和底端。而位于二个至日中点的分点,分别是2024年9月22日的秋分以及2025年3月20日的春分(即今日),它们则标志了北半球秋季与春季的起点。这个摄于斯蒂芬维尔镇日行迹图,由于组成之一是记录于2024年4月8日的UTC18:38:40,因此也拍下了日全食期间悬在地球天空中的日冕。
明日的图片: pixels in space