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目前顯示的是有「perihelion」標籤的文章

moon at perigee (closest to Earth) 2023

 using NAIF WebGeoCalc DistanceFinder  2023-08-02 05:52:06.316514 UTC,  357,311 km ( 11 h 20 m after full moon) and also: 2023-08-30 15:54:18.934966 UTC ( Super moon and perigee), Angular size 32.95', 357,341 km reference; HKO : 01 Aug 13:52  and 31 Aug 02:08 HKT interesting VO : 2023年8月2日2时32分满月,由于该时发生于8月2日13时52分月球过近地点(约35万7311公里)之前仅相差约11小时20分钟,因此该次满月看起来会较大。满月时月球距离地球约35万7528.078公里,月面视直径33.052角分,使其成为年度第二大满月。 本年(2023)最大满月发生在8月31日9时36分。由于月球在30日23时54分通过近地点(约35万7181公里)后近9个小时42分钟,因相对距离月球比较近,所以月面看起来会觉得比较大 ,是本年度13次满月中的最大满月,满月时月球距离地球约35万7340.93公里,月面视直径约为33.43角分,比今年2月6日那次满月(年度最小满月)的视直径大了约13.5%。 inthesky   EarthSky NASA Fred Espanak   NAOJ In fact, moon is at closest on 21 Jan, 20:57:06 2023 UTC (New moon)

to find sun aphelion and perihelion using NAIF tool

 from webgeocalc DistanceFinder Aphelion of 2023: 2023-07-06 20:06:38.435260 UTC similarly, periphelion of 2023: 2023-01-04 16:17:27.532134 UTC IMCCE: slowest orbital speed is on aphelion? de-mythstified:  According to Kepler's laws , AMS >> Yes.  But by observation >> Sort of: 10 July in 2023(sqrt(dx^2+dy^2)): IERS dx: dy: 60135 is modified Julian date,  Keisan   Solar Distance can be found by JPL SSD , reading AD (Apoapsis distance) column, time is in TDB   Reference: IMCCE perihelion 2023 IMCCE aphelion 2023   earthscience stackexchange and python script( less than 15 sec of deviation)  Jay Tanner PHP GSFC Earth fact sheet Better than 1 minute resolution  , UTC2TDB  online convertor