Matahari pas tajadianyaekuinoks Maret di tahun 2019, haratan bagian tangah cakram matahari tatamu lawanekuator langit (garis imajiner dibola langit diatasekuator bumi) matam salatan ka utara.
Ekuinoks marupakan fenomena pasekuator langit lawanekuatorbumi malewati pusat geometris matan cakrammatahari.[1][2] Fenomena ngini tajadi dua kali satiap tahunnya, yaitu, pas sakitar20 Maret wan23 September. Kawa disambat, bahwa kajadian ngini marupakan fenomena haratan tangah matahari kawa taitihi baandakpas di atas ekuator
Kata ekuinoks diambil matan basaLatinaequinoctium, nang baasal matan kataaequus nang artinya sama wannox (genitifnoctis) nang baisi arti malam. Pas harinya ekuinoks cungul, siang wan malam waktunya sama di sabarataan wilayah di Bumi. Tapi kada sabarataan jua sama, hal ngini maragaukuran buncu matahari,refraksi atmosfir, wan paubahan hancap hari nang cungul di kabanyakan di garis lintang parak ekuinoks. Jauh sabalum parsamaan nang ngini ditamuakan, budaya ekuator primitif sudah mancatat hari apa haja Matahari cungul ditimur wan tinggalam dibarat, wan kajadian ngini dasar parak banar lawan kajadiakan nang ditantuakan sacara astronomis. Akibatnya, manurutjam matahari nang diulah wan diatur bujur-bujur, siang hari waktunya 12 jam.
Di balamahan bumi nang tangah ngarannyaekuinoks mara utaragasanequinox Maret, hal ngini manampaiakan bahwa haratan ngitu matahari malewati ekuator langit di arah mara ka utara, wanekuinoks mara salatan gasanekuinoks September, manamapaikan bahwa haratan ngitu matahari malewati ekuator langit di arah mara ka salatan.
HaratanSaturnus baada di kundisi ekuinokscincinnya mamantulakan sadikit cahaya matahari, nang kawa diitihi digambar nginiCassini pas 2009.
Ekuinoks cungul di bamacam-macam planet nang baisi sumbu rotasi miring. Contahnya adalah planet Saturnus, dimana ekuinoksnya baandak dicincinnya nang mahadap ka Matahari. Akibatnya, ekuinoksnyabtalihat nang kaya garis tipis amun diitihi mulai matan Bumi. Amun diitihi mulai atas - pamandangan pas ekuinoks nang pamulaan diitihi matan pasawat luar angkasaCassini pas tahun 2009, buhannya mandapatakan sadikitcahaya matahari wara; buhannya malahan tabanyak mandapatisilauan planet pada silau matan matahari.[4]
^"Equinoxes".Astronomical Information Center.United States Naval Observatory. 14 June 2019. Diarsipkan dariversi asli tanggal 25 May 2019. Diakses tanggal9 July 2019.On the day of an equinox, the geometric center of the Sun's disk crosses the equator, and this point is above the horizon for 12 hours everywhere on the Earth. However, the Sun is not simply a geometric point. Sunrise is defined as the instant when the leading edge of the Sun's disk becomes visible on the horizon, whereas sunset is the instant when the trailing edge of the disk disappears below the horizon. These are the moments of first and last direct sunlight. At these times the center of the disk is below the horizon. Furthermore, atmospheric refraction causes the Sun's disk to appear higher in the sky than it would if the Earth had no atmosphere. Thus, in the morning the upper edge of the disk is visible for several minutes before the geometric edge of the disk reaches the horizon. Similarly, in the evening the upper edge of the disk disappears several minutes after the geometric disk has passed below the horizon. The times of sunrise and sunset in almanacs are calculated for the normal atmospheric refraction of 34 minutes of arc and asemidiameter of 16 minutes of arc for the disk. Therefore, at the tabulated time the geometric center of the Sun is actually 50 minutes of arc below a regular and unobstructed horizon for an observer on the surface of the Earth in a level regionParameter|url-status= yang tidak diketahui akan diabaikan (bantuan)
