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 May 09 - Fri Local Time = 12:54:30 Standard Time Std. Time Zone Offset = 00:00:00 Applied Delta T = +00:00:00 Astronomical JD TT = 2460805.03784722 =========================================================================== Geocentric Equatorial Coordinates of Neptune Right Ascension = 00h 06m 58.85s = 0.1163464h = 1.7451960° Declination = -00° 38' 26.65" = -0.640737° True Distance = 30.559487119 AU = 4.571634202 Bkm = 2.840681795 Bmi Visual Magnitude = +7.9 Angular Diameter = 0.220" Horizontal Parallax = 0.288" = 0.004796' = 0.000079937° Light/Signal Time = 04h 14m 09.33s =========================================================================== 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 06m 58.85s = 0.1163476h = 1.7452135° Topocentric Decl = -00° 38' 26.85" = -0.640792° Local Hour Angle = +22h 50m 33.32s = 342.63881520084° (W=Negative) Local Sidereal Time = 22h 57m 32.167s = 22.958935250h = 344.384028744° Azimuth = 335.54448° (Measured clockwise from S=0°) = 155.54448° (Measured clockwise from N=0°) Direction = SSE Altitude = +43.88461° (Above Local Horizon - No refractions applied) =========================================================================== Neptune Ephemeris Table For Each Day Of May 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 2460794 0.0960635 -00.765475 30.684318392 +7.9 xx 2460795 0.0980047 -00.753448 30.674065339 +7.9 xx 2460796 0.0999276 -00.741551 30.663591532 +7.9 xx 2460797 0.1018311 -00.729791 30.652900357 +7.9 1 2460798 0.1037143 -00.718173 30.641995248 +7.9 2 2460799 0.1055762 -00.706704 30.630879649 +7.9 3 2460800 0.1074163 -00.695387 30.619556993 +7.9 4 2460801 0.1092342 -00.684225 30.608030692 +7.9 5 2460802 0.1110298 -00.673218 30.596304137 +7.9 6 2460803 0.1128028 -00.662367 30.584380701 +7.9 7 2460804 0.1145534 -00.651672 30.572263741 +7.9 8 2460805 0.1162814 -00.641133 30.559956601 +7.9 9 2460806 0.1179868 -00.630750 30.547462621 +7.9 10 2460807 0.1196695 -00.620524 30.534785130 +7.9 11 2460808 0.1213293 -00.610456 30.521927456 +7.9 12 2460809 0.1229659 -00.600547 30.508892925 +7.9 13 2460810 0.1245788 -00.590801 30.495684866 +7.9 14 2460811 0.1261676 -00.581219 30.482306618 +7.9 15 2460812 0.1277317 -00.571806 30.468761537 +7.9 16 2460813 0.1292704 -00.562567 30.455053001 +7.9 17 2460814 0.1307831 -00.553504 30.441184424 +7.9 18 2460815 0.1322692 -00.544622 30.427159265 +7.9 19 2460816 0.1337282 -00.535924 30.412981043 +7.9 20 2460817 0.1351597 -00.527412 30.398653355 +7.9 21 2460818 0.1365638 -00.519086 30.384179896 +7.9 22 2460819 0.1379405 -00.510946 30.369564487 +7.9 23 2460820 0.1392900 -00.502990 30.354811096 +7.9 24 2460821 0.1406127 -00.495216 30.339923856 +7.9 25 2460822 0.1419085 -00.487624 30.324907070 +7.9 26 2460823 0.1431769 -00.480217 30.309765190 +7.9 27 2460824 0.1444170 -00.473001 30.294502781 +7.9 28 2460825 0.1456280 -00.465980 30.279124469 +7.9 29 2460826 0.1468090 -00.459160 30.263634894 +7.9 30 2460827 0.1479594 -00.452546 30.248038670 +7.9 31 2460828 0.1490788 -00.446139 30.232340368 +7.9 xx 2460829 0.1501672 -00.439939 30.216544502 +7.9 xx 2460830 0.1512248 -00.433945 30.200655536 +7.9 xx JD12_TT RA_Hr Decl_Deg Dist_AU VMag Day ===========================================================================