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 = 2026 Sep 17 - Thu Local Time = 11:18:04 Standard Time Std. Time Zone Offset = 00:00:00 Applied Delta T = +00:00:00 Astronomical JD TT = 2461300.97087963 =========================================================================== Geocentric Equatorial Coordinates of Neptune Right Ascension = 00h 14m 49.35s = 0.2470421h = 3.7056315° Declination = -00° 00' 54.26" = -0.015071° True Distance = 28.884580583 AU = 4.321071751 Bkm = 2.684989506 Bmi Visual Magnitude = +7.8 Angular Diameter = 0.233" Horizontal Parallax = 0.304" = 0.005074' = 0.000084572° Light/Signal Time = 04h 00m 13.54s =========================================================================== 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 14m 49.34s = 0.2470380h = 3.7055695° Topocentric Decl = -00° 00' 54.46" = -0.015128° Local Hour Angle = +05h 41m 32.97s = 85.387376544491° (W=Negative) Local Sidereal Time = 05h 56m 22.307s = 5.939529737h = 89.092946049° Azimuth = 86.85406° (Measured clockwise from S=0°) = 266.85406° (Measured clockwise from N=0°) Direction = W Altitude = +3.37506° (Above Local Horizon - No refractions applied) =========================================================================== Neptune Ephemeris Table For Each Day Of Sep. 2026 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 2461282 0.2653263 +00.185982 28.980051007 +7.8 xx 2461283 0.2638766 +00.176047 28.972537811 +7.8 xx 2461284 0.2624102 +00.166016 28.965287339 +7.8 xx 2461285 0.2609281 +00.155896 28.958302059 +7.8 1 2461286 0.2594312 +00.145693 28.951584457 +7.8 2 2461287 0.2579200 +00.135411 28.945137042 +7.8 3 2461288 0.2563949 +00.125054 28.938962326 +7.8 4 2461289 0.2548562 +00.114621 28.933062816 +7.8 5 2461290 0.2533038 +00.104115 28.927440984 +7.8 6 2461291 0.2517377 +00.093535 28.922099236 +7.8 7 2461292 0.2501582 +00.082881 28.917039882 +7.8 8 2461293 0.2485656 +00.072158 28.912265095 +7.8 9 2461294 0.2469607 +00.061369 28.907776888 +7.8 10 2461295 0.2453447 +00.050523 28.903577084 +7.8 11 2461296 0.2437185 +00.039625 28.899667317 +7.8 12 2461297 0.2420834 +00.028685 28.896049028 +7.8 13 2461298 0.2404403 +00.017707 28.892723482 +7.8 14 2461299 0.2387901 +00.006699 28.889691786 +7.8 15 2461300 0.2371334 -00.004335 28.886954904 +7.8 16 2461301 0.2354707 -00.015393 28.884513680 +7.8 17 2461302 0.2338024 -00.026470 28.882368839 +7.8 18 2461303 0.2321291 -00.037564 28.880521004 +7.8 19 2461304 0.2304511 -00.048673 28.878970700 +7.8 20 2461305 0.2287687 -00.059794 28.877718355 +7.8 21 2461306 0.2270824 -00.070924 28.876764310 +7.8 22 2461307 0.2253928 -00.082060 28.876108822 +7.8 23 2461308 0.2237004 -00.093198 28.875752081 +7.8 24 2461309 0.2220060 -00.104334 28.875694218 +7.8 25 2461310 0.2203105 -00.115462 28.875935330 +7.8 26 2461311 0.2186149 -00.126575 28.876475496 +7.8 27 2461312 0.2169204 -00.137667 28.877314793 +7.8 28 2461313 0.2152279 -00.148729 28.878453310 +7.8 29 2461314 0.2135382 -00.159758 28.879891144 +7.8 30 2461315 0.2118520 -00.170750 28.881628391 +7.8 xx 2461316 0.2101693 -00.181702 28.883665121 +7.8 xx 2461317 0.2084904 -00.192614 28.886001351 +7.8 xx JD12_TT RA_Hr Decl_Deg Dist_AU VMag Day ===========================================================================