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 Sep 16 - Tue Local Time = 04:11:16 Standard Time Std. Time Zone Offset = 00:00:00 Applied Delta T = +00:00:00 Astronomical JD TT = 2460934.67449074 =========================================================================== Geocentric Equatorial Coordinates of Neptune Right Ascension = 00h 11m 46.33s = 0.1962040h = 2.9430600° Declination = -00° 52' 37.95" = -0.877209° True Distance = 28.890517845 AU = 4.321959953 Bkm = 2.685541409 Bmi Visual Magnitude = +7.8 Angular Diameter = 0.233" Horizontal Parallax = 0.304" = 0.005073' = 0.000084554° Light/Signal Time = 04h 00m 16.51s =========================================================================== 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 11m 46.34s = 0.1962055h = 2.9430829° Topocentric Decl = -00° 52' 38.16" = -0.877267° Local Hour Angle = +22h 33m 38.29s = 338.4095404806° (W=Negative) Local Sidereal Time = 22h 45m 24.630s = 22.756841558h = 341.352623365° Azimuth = 330.19743° (Measured clockwise from S=0°) = 150.19743° (Measured clockwise from N=0°) Direction = SSE Altitude = +42.24509° (Above Local Horizon - No refractions applied) =========================================================================== Neptune Ephemeris Table For Each Day Of Sep. 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 2460917 0.1232871 -00.687872 28.970029716 +7.8 xx 2460918 0.1217986 -00.698041 28.963198869 +7.8 xx 2460919 0.1202955 -00.708291 28.956638984 +7.8 xx 2460920 0.1187782 -00.718619 28.950352023 +7.8 1 2460921 0.1172470 -00.729023 28.944339835 +7.8 2 2460922 0.1157023 -00.739500 28.938604168 +7.8 3 2460923 0.1141442 -00.750050 28.933146669 +7.8 4 2460924 0.1125730 -00.760671 28.927968898 +7.8 5 2460925 0.1109892 -00.771359 28.923072348 +7.8 6 2460926 0.1093931 -00.782113 28.918458468 +7.8 7 2460927 0.1077858 -00.792925 28.914128693 +7.8 8 2460928 0.1061683 -00.803790 28.910084476 +7.8 9 2460929 0.1045416 -00.814699 28.906327306 +7.8 10 2460930 0.1029070 -00.825646 28.902858715 +7.8 11 2460931 0.1012651 -00.836626 28.899680264 +7.8 12 2460932 0.0996166 -00.847634 28.896793518 +7.8 13 2460933 0.0979615 -00.858670 28.894200015 +7.8 14 2460934 0.0963000 -00.869733 28.891901228 +7.8 15 2460935 0.0946322 -00.880821 28.889898533 +7.8 16 2460936 0.0929584 -00.891934 28.888193187 +7.8 17 2460937 0.0912791 -00.903068 28.886786301 +7.8 18 2460938 0.0895948 -00.914218 28.885678832 +7.8 19 2460939 0.0879066 -00.925379 28.884871570 +7.8 20 2460940 0.0862153 -00.936544 28.884365133 +7.8 21 2460941 0.0845221 -00.947707 28.884159970 +7.8 22 2460942 0.0828280 -00.958859 28.884256364 +7.8 23 2460943 0.0811340 -00.969996 28.884654438 +7.8 24 2460944 0.0794408 -00.981111 28.885354164 +7.8 25 2460945 0.0777493 -00.992200 28.886355373 +7.8 26 2460946 0.0760602 -01.003257 28.887657759 +7.8 27 2460947 0.0743739 -01.014281 28.889260892 +7.8 28 2460948 0.0726909 -01.025266 28.891164216 +7.8 29 2460949 0.0710117 -01.036211 28.893367060 +7.8 30 2460950 0.0693366 -01.047114 28.895868636 +7.8 xx 2460951 0.0676659 -01.057972 28.898668056 +7.8 xx 2460952 0.0660001 -01.068783 28.901764334 +7.8 xx JD12_TT RA_Hr Decl_Deg Dist_AU VMag Day ===========================================================================