Neptune Ephemeris Calculator
Based on the NASA/JPL DE405 Ephemeris Model
PHP Program By Jay Tanner
Date: (1600 to 2200) Y m d
Local Time (00h to 24h) H:M:S
Local Time Zone Offset ±H:M
Undefined1
Std. Time = UT
Apply ΔT
+00:00:00
Daylight / Summer Time
Undefined3
Longitude ±Deg.d M S
(Neg=W)
Latitude ±Deg.d M S
(Neg=S)
Sea Level Elevation
(± meters)
This program uses a cookie to store and remember the interface settings between calls.
Neptune Ephemeris Statistics Referred to True Ecliptic and Equinox of Date Based on the NASA/JPL DE405 Ephemeris Model Local Date = 2025 Oct 17 - Fri Local Time = 05:39:50 Standard Time Std. Time Zone Offset = 00:00:00 Applied Delta T = +00:00:00 Astronomical JD TT = 2460965.73599537 =========================================================================== Geocentric Equatorial Coordinates of Neptune Right Ascension = 00h 07m 55.40s = 0.1320553h = 1.9808295° Declination = -01° 12' 35.68" = -1.209911° True Distance = 28.973763405 AU = 4.334413311 Bkm = 2.693279567 Bmi Visual Magnitude = +7.8 Angular Diameter = 0.232" Horizontal Parallax = 0.304" = 0.005059' = 0.000084311° Light/Signal Time = 04h 00m 58.05s =========================================================================== Local Topocentric Coordinates of Neptune For Geographic Location: Longitude = -76.833611111° = -05h 07m 20.1s (W=Negative) Latitude = +42.752194444° Elevation = 0 m Topocentric RA = 00h 07m 55.39s = 0.1320531h = 1.9807965° Topocentric Decl = -01° 12' 35.89" = -1.209969° Local Hour Angle = +02h 08m 30.96s = 32.128996587293° (W=Negative) Local Sidereal Time = 02h 16m 26.350s = 2.273986207h = 34.109793104° Azimuth = 42.01335° (Measured clockwise from S=0°) = 222.01335° (Measured clockwise from N=0°) Direction = SW Altitude = +37.39944° (Above Local Horizon - No refractions applied) =========================================================================== Neptune Ephemeris Table For Each Day Of Oct. 2025 at 12:00 TT There are three extra (xx) padding days at each end of the table. JD12_TT RA_Hr Decl_Deg Dist_AU VMag Day 2460947 0.0743739 -01.014281 28.889260892 +7.8 xx 2460948 0.0726909 -01.025266 28.891164216 +7.8 xx 2460949 0.0710117 -01.036211 28.893367060 +7.8 xx 2460950 0.0693366 -01.047114 28.895868636 +7.8 1 2460951 0.0676659 -01.057972 28.898668056 +7.8 2 2460952 0.0660001 -01.068783 28.901764334 +7.8 3 2460953 0.0643397 -01.079544 28.905156414 +7.8 4 2460954 0.0626854 -01.090249 28.908843193 +7.8 5 2460955 0.0610383 -01.100893 28.912823551 +7.8 6 2460956 0.0593994 -01.111468 28.917096388 +7.8 7 2460957 0.0577702 -01.121965 28.921660642 +7.8 8 2460958 0.0561515 -01.132379 28.926515294 +7.8 9 2460959 0.0545440 -01.142706 28.931659349 +7.8 10 2460960 0.0529479 -01.152945 28.937091797 +7.8 11 2460961 0.0513632 -01.163094 28.942811570 +7.8 12 2460962 0.0497901 -01.173154 28.948817500 +7.8 13 2460963 0.0482286 -01.183123 28.955108287 +7.8 14 2460964 0.0466792 -01.193000 28.961682477 +7.8 15 2460965 0.0451427 -01.202779 28.968538454 +7.8 16 2460966 0.0436196 -01.212456 28.975674432 +7.8 17 2460967 0.0421112 -01.222024 28.983088459 +7.8 18 2460968 0.0406182 -01.231477 28.990778415 +7.8 19 2460969 0.0391416 -01.240809 28.998742022 +7.8 20 2460970 0.0376825 -01.250014 29.006976845 +7.8 21 2460971 0.0362416 -01.259086 29.015480304 +7.8 22 2460972 0.0348197 -01.268021 29.024249677 +7.8 23 2460973 0.0334172 -01.276816 29.033282113 +7.8 24 2460974 0.0320348 -01.285467 29.042574642 +7.8 25 2460975 0.0306727 -01.293973 29.052124177 +7.8 26 2460976 0.0293313 -01.302331 29.061927532 +7.8 27 2460977 0.0280109 -01.310539 29.071981418 +7.8 28 2460978 0.0267118 -01.318596 29.082282462 +7.8 29 2460979 0.0254341 -01.326502 29.092827210 +7.8 30 2460980 0.0241784 -01.334252 29.103612140 +7.8 31 2460981 0.0229450 -01.341845 29.114633689 +7.8 xx 2460982 0.0217348 -01.349276 29.125888268 +7.8 xx 2460983 0.0205485 -01.356539 29.137372301 +7.8 xx JD12_TT RA_Hr Decl_Deg Dist_AU VMag Day ===========================================================================