![]() ![]() For more information on the API, please see the documentation page. The API returns data in JavaScript Object Notation (JSON) format for users who wish to manipulate data into a customized format. This data service uses one of our Application Programming Interfaces (APIs). If you set the "Account for US Daylight Saving Time" radio button on, the results will include a 1 hour offset to the given Time Zone hour if the requested date occurs during a DST period. (DST) rules for dates from 1967 through the present day in accordance with the Uniform Time Act of 1966 and subsequent legislation. This service implements US daylight saving time The time zone field can accommodate up to five characters. Spring (or Vernal) Equinox is usually March 20, and Fall (or. You may enter 5.5 hours east of Greenwich for The sun is directly overhead at high-noon on the equator twice per year, at the two equinoxes. Time Zone hours field and set the Time Zone direction button according to the standard US time zone entered.įor locations that require it, you may enter the time zone in decimal hours. Based on a Celtic tradition, it’s the halfway point between winter solstice and the spring equinox. Egyptians, watching for the rise of the star, Sirius, tied. (1) Different pagan civilizations used these different points as anchors, tying the lunar year to the longer solar year. "Need a US Time Zone" button, the service will fill the Imbolc is a pagan holiday celebrated from February 1 to 2. There are only four points in a solar year to which the lunar year may be anchored: vernal (spring) equinox summer solstice autumnal equinox and winter solstice. The Seasons and the Earth's Orbit discusses how all of these phenomena relate. The times of apsides appear to vary more than those of the seasons. ![]() The page on Variation in Times of Perihelion and Aphelion explains why Therefore, the equinox in March is referred toĪs the Spring Equinox even though Fall is happening in the southern hemisphere. That said, the conventional method for naming the solstices andĮquinoxes is by the seasons of the northern hemisphere. While the northern hemisphere experiences summer, the southern Solstices mark the beginning of summer and winter. The times of the equinoxes mark the beginning of spring and fall. Celestial Navigation Data for Assumed Position and Time.Earth's Seasons - Equinoxes, Solstices, Perihelion, and Aphelion.Topocentric Positions of Major Solar System Objects and Bright Stars.Geocentric Positions of Major Solar System Objects and Bright Stars.Topocentric Configuration of Major Solar System Bodies.Altitude and Azimuth of the Sun or Moon During One Day.Positions of Selected Celestial Objects.Duration of Daylight and Darkness Table for One Year.Rise/Set/Transit Times for Major Solar System Objects and Bright Stars.Table of Sunrise/Sunset, Moonrise/Moonset, or Twilight Times for an Entire Year. ![]()
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