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Sunrise, sunset, or sun position for any location – U.S. only; Sunrise, sunset and day length for any location – Worldwide; Rise/Set/Transit/Twilight Data – U.S. only; Astronomical Information Center; Converting Between Julian Dates and Gregorian Calendar Dates; Approximate Solar Coordinates; Algorithms for Computing Astronomical Phenomena
This page was last edited on 28 February 2025, at 19:36 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.
Lighting-up time, sunrise/sunset and twilights at the National Maritime Museum, Greenwich, United Kingdom; Lighting-up time at the Royal Observatory Edinburgh; D. O'Leary, When to light up: a pocket treatise on the Lights on vehicles act, 1907 containing a full explanation of the act, with a table showing the lighting-up time Published 1908
The government scraps a plan to phase out gas boilers in UK homes by 2035. [16] 2025 United Kingdom floods: Dozens of people are rescued amid disruption from snow, ice, and flooding around much of the country. An overnight low of −13.3 °C (8 °F) is recorded, again in Loch Glascarnoch. [17]
Twilight occurs according to the solar elevation angle θ s, which is the position of the geometric center of the Sun relative to the horizon. There are three established and widely accepted subcategories of twilight: civil twilight (nearest the horizon), nautical twilight, and astronomical twilight (farthest from the horizon).
The times of sunset and sunrise vary with the observer's location (longitude and latitude), so the dates when day and night are equal also depend upon the observer's location. A third correction for the visual observation of a sunrise (or sunset) is the angle between the apparent horizon as seen by an observer and the geometric (or sensible ...
A solstice is the time when the Sun reaches its most northerly or southerly excursion relative to the celestial equator on the celestial sphere.Two solstices occur annually, around 20–22 June and 20–22 December.
The Persian calendar begins each year at the northward equinox, observationally determined at Tehran. [15] The Indian national calendar starts the year on the day next to the vernal equinox on 22 March (21 March in leap years) with a 30-day month (31 days in leap years), then has 5 months of 31 days followed by 6 months of 30 days. [15]