On the International Space Station, zenith and nadir are used instead of up and down, referring to directions within and around the station, relative to the earth. The NASA Orbital Debris Observatory and the Large Zenith Telescope are both zenith telescopes, since the use of liquid mirrors meant these telescopes could only point straight up. The astronomical meridian is also determined by the zenith, and is defined as a circle on the celestial sphere that passes through the zenith, nadir, and the celestial poles.Ī zenith telescope is a type of telescope designed to point straight up at or near the zenith, and used for precision measurement of star positions, to simplify telescope construction, or both. In astronomy, the altitude in the horizontal coordinate system and the zenith angle are complementary angles, with the horizon perpendicular to the zenith. Īt a given location during the course of a day, the Sun reaches not only its zenith but also its nadir, at the antipode of that location 12 hours from solar noon. In Islamic astronomy, the passing of the Sun over the zenith of Mecca becomes the basis of the qibla observation by shadows twice a year on 27/28 May and 15/16 July. The Sun reaches the observer's zenith when it is 90° above the horizon, and this only happens between the Tropic of Cancer and the Tropic of Capricorn. A Universal Time From Noob To Gaster Master In One Video KTG Gaming 1.1M views 2 years ago (AUT) Obtaining SPTW but in a Public Server Skiez 1.2M views 1 year ago Enjoy 1 week of live TV on us. a star) and the local zenith - that is, the complement of the altitude angle (or elevation angle). The dashed black lines in the bottom row of p -UT plots show the minimum value at that UT. In a scientific context, the zenith is the direction of reference for measuring the zenith angle (or zenith angular distance), the angle between a direction of interest (e.g. Solar Zenith Angle (SZA) When observing a given point on the Earths surface from a satellite-based instrument, the Solar Zenith Angle (SZA) is the angle between the local zenith (i.e. numeric the number of hours to add to UTC (Coordinated Universal Time) to. This sense of the word is often used to describe the position of the Sun ("The sun reached its zenith."), but to an astronomer, the Sun does not have its own zenith and is at the zenith only if it is directly overhead. The function calculates the zenith angle, the location of the sun as an angle. The term zenith sometimes means the highest point, way, or level reached by a celestial body on its daily apparent path around a given point of observation.
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