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 Dec 03 - Wed Local Time = 02:53:09 Standard Time Std. Time Zone Offset = 00:00:00 Applied Delta T = +00:00:00 Astronomical JD TT = 2461012.62024306 =========================================================================== Geocentric Equatorial Coordinates of Neptune Right Ascension = 23h 59m 54.23s = 23.9983975h = 359.9759625° Declination = -01° 28' 59.24" = -1.483121° True Distance = 29.563189651 AU = 4.422590223 Bkm = 2.748070159 Bmi Visual Magnitude = +7.9 Angular Diameter = 0.227" Horizontal Parallax = 0.297" = 0.004958' = 0.000082630° Light/Signal Time = 04h 05m 52.17s =========================================================================== 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 = 23h 59m 54.22s = 23.9983950h = 359.9759245° Topocentric Decl = -01° 28' 59.44" = -1.483178° Local Hour Angle = -21h 25m 18.13s = -321.32553609122° (W=Negative) Local Sidereal Time = 02h 34m 36.093s = 2.576692561h = 38.650388422° Azimuth = 48.70016° (Measured clockwise from S=0°) = 228.70016° (Measured clockwise from N=0°) Direction = SW Altitude = +33.74581° (Above Local Horizon - No refractions applied) =========================================================================== Neptune Ephemeris Table For Each Day Of Dec. 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 2461008 0.0000310 -01.475633 29.488091857 +7.9 xx 2461009 23.9996156 -01.477664 29.504151913 +7.9 xx 2461010 23.9992338 -01.479472 29.520323586 +7.9 xx 2461011 23.9988862 -01.481053 29.536601770 +7.9 1 2461012 23.9985736 -01.482402 29.552981443 +7.9 2 2461013 23.9982965 -01.483516 29.569457680 +7.9 3 2461014 23.9980551 -01.484394 29.586025658 +7.9 4 2461015 23.9978493 -01.485039 29.602680631 +7.9 5 2461016 23.9976783 -01.485453 29.619417891 +7.9 6 2461017 23.9975416 -01.485642 29.636232708 +7.9 7 2461018 23.9974388 -01.485608 29.653120288 +7.9 8 2461019 23.9973698 -01.485352 29.670075735 +7.9 9 2461020 23.9973348 -01.484872 29.687094037 +7.9 10 2461021 23.9973343 -01.484166 29.704170070 +7.9 11 2461022 23.9973687 -01.483231 29.721298610 +7.9 12 2461023 23.9974386 -01.482064 29.738474340 +7.9 13 2461024 23.9975442 -01.480663 29.755691872 +7.9 14 2461025 23.9976860 -01.479026 29.772945755 +7.9 15 2461026 23.9978641 -01.477151 29.790230482 +7.9 16 2461027 23.9980785 -01.475039 29.807540503 +7.9 17 2461028 23.9983293 -01.472691 29.824870229 +7.9 18 2461029 23.9986163 -01.470107 29.842214039 +7.9 19 2461030 23.9989391 -01.467290 29.859566292 +7.9 20 2461031 23.9992976 -01.464241 29.876921336 +7.9 21 2461032 23.9996913 -01.460965 29.894273519 +7.9 22 2461033 0.0001200 -01.457462 29.911617204 +7.9 23 2461034 0.0005833 -01.453734 29.928946786 +7.9 24 2461035 0.0010812 -01.449784 29.946256703 +7.9 25 2461036 0.0016137 -01.445611 29.963541454 +7.9 26 2461037 0.0021808 -01.441214 29.980795620 +7.9 27 2461038 0.0027830 -01.436592 29.998013876 +7.9 28 2461039 0.0034206 -01.431743 30.015191009 +7.9 29 2461040 0.0040937 -01.426666 30.032321939 +7.9 30 2461041 0.0048025 -01.421360 30.049401717 +7.9 31 2461042 0.0055466 -01.415829 30.066425526 +7.9 xx 2461043 0.0063254 -01.410076 30.083388658 +7.9 xx 2461044 0.0071378 -01.404108 30.100286472 +7.9 xx JD12_TT RA_Hr Decl_Deg Dist_AU VMag Day ===========================================================================