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 Aug 31 - Sun Local Time = 08:52:42 Standard Time Std. Time Zone Offset = 00:00:00 Applied Delta T = +00:00:00 Astronomical JD TT = 2460918.86993056 =========================================================================== Geocentric Equatorial Coordinates of Neptune Right Ascension = 00h 10m 09.17s = 0.1692149h = 2.5382235° Declination = -00° 42' 25.03" = -0.706953° True Distance = 28.957476824 AU = 4.331976873 Bkm = 2.691765635 Bmi Visual Magnitude = +7.8 Angular Diameter = 0.232" Horizontal Parallax = 0.304" = 0.005062' = 0.000084359° Light/Signal Time = 04h 00m 49.92s =========================================================================== 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 10m 09.16s = 0.1692126h = 2.5381892° Topocentric Decl = -00° 42' 25.24" = -0.707011° Local Hour Angle = +02h 14m 22.81s = 33.59503991471° (W=Negative) Local Sidereal Time = 02h 24m 31.975s = 2.408881939h = 36.133229084° Azimuth = 43.92386° (Measured clockwise from S=0°) = 223.92386° (Measured clockwise from N=0°) Direction = SW Altitude = +37.10111° (Above Local Horizon - No refractions applied) =========================================================================== Neptune Ephemeris Table For Each Day Of Aug. 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 2460886 0.1590352 -00.434433 29.300487664 +7.8 xx 2460887 0.1582610 -00.440292 29.286759940 +7.8 xx 2460888 0.1574583 -00.446328 29.273202014 +7.8 xx 2460889 0.1566277 -00.452538 29.259817846 +7.8 1 2460890 0.1557694 -00.458919 29.246611309 +7.8 2 2460891 0.1548840 -00.465468 29.233586190 +7.8 3 2460892 0.1539716 -00.472184 29.220746195 +7.8 4 2460893 0.1530325 -00.479064 29.208094947 +7.8 5 2460894 0.1520666 -00.486108 29.195635993 +7.8 6 2460895 0.1510742 -00.493315 29.183372809 +7.8 7 2460896 0.1500550 -00.500686 29.171308806 +7.8 8 2460897 0.1490093 -00.508220 29.159447356 +7.8 9 2460898 0.1479372 -00.515916 29.147791804 +7.8 10 2460899 0.1468392 -00.523769 29.136345504 +7.8 11 2460900 0.1457161 -00.531776 29.125111836 +7.8 12 2460901 0.1445688 -00.539931 29.114094228 +7.8 13 2460902 0.1433980 -00.548228 29.103296167 +7.8 14 2460903 0.1422048 -00.556660 29.092721195 +7.8 15 2460904 0.1409895 -00.565226 29.082372898 +7.8 16 2460905 0.1397524 -00.573921 29.072254886 +7.8 17 2460906 0.1384936 -00.582747 29.062370765 +7.8 18 2460907 0.1372130 -00.591703 29.052724108 +7.8 19 2460908 0.1359106 -00.600789 29.043318422 +7.8 20 2460909 0.1345864 -00.610005 29.034157123 +7.8 21 2460910 0.1332409 -00.619347 29.025243504 +7.8 22 2460911 0.1318745 -00.628813 29.016580725 +7.8 23 2460912 0.1304881 -00.638397 29.008171793 +7.8 24 2460913 0.1290826 -00.648092 29.000019564 +7.8 25 2460914 0.1276589 -00.657894 28.992126745 +7.8 26 2460915 0.1262179 -00.667794 28.984495898 +7.8 27 2460916 0.1247603 -00.677789 28.977129454 +7.8 28 2460917 0.1232871 -00.687872 28.970029716 +7.8 29 2460918 0.1217986 -00.698041 28.963198869 +7.8 30 2460919 0.1202955 -00.708291 28.956638984 +7.8 31 2460920 0.1187782 -00.718619 28.950352023 +7.8 xx 2460921 0.1172470 -00.729023 28.944339835 +7.8 xx 2460922 0.1157023 -00.739500 28.938604168 +7.8 xx JD12_TT RA_Hr Decl_Deg Dist_AU VMag Day ===========================================================================