Neptune Ephemeris Calculator
Based on the NASA/JPL DE405 Ephemeris Model
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 Jul 15 - Wed Local Time = 12:13:18 Standard Time Std. Time Zone Offset = 00:00:00 Applied Delta T = +00:00:00 Astronomical JD TT = 2461237.00923611 =========================================================================== Geocentric Equatorial Coordinates of Neptune Right Ascension = 00h 18m 33.92s = 0.3094234h = 4.6413510° Declination = +00° 28' 58.86" = +0.483017° True Distance = 29.539570386 AU = 4.419056831 Bkm = 2.745874612 Bmi Visual Magnitude = +7.9 Angular Diameter = 2.268" Horizontal Parallax = 0.298" = 0.004962' = 0.000082697° Light/Signal Time = 04h 05m 40.39s =========================================================================== 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 18m 33.92s = 0.3094211h = 4.6413159° Topocentric Decl = +00° 28' 58.66" = +0.482962° Local Hour Angle = +02h 20m 51.95s = 35.216438035963° (W=Negative) Local Sidereal Time = 02h 39m 25.861s = 2.657183598h = 39.857753963° Azimuth = 46.43925° (Measured clockwise from S=0°) = 226.43925° (Measured clockwise from N=0°) Direction = SW Altitude = +37.27245° (Above Local Horizon - No refractions applied) =========================================================================== Neptune Ephemeris Table For Each Day Of Jul. 2014 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 2461220 0.3050494 +00.494856 29.820065383 +7.9 xx 2461221 0.3053571 +00.495884 29.803260420 +7.9 xx 2461222 0.3056316 +00.496696 29.786472206 +7.9 xx 2461223 0.3058726 +00.497292 29.769705128 +7.9 1 2461224 0.3060797 +00.497669 29.752963577 +7.9 2 2461225 0.3062530 +00.497827 29.736251957 +7.9 3 2461226 0.3063922 +00.497766 29.719574700 +7.9 4 2461227 0.3064975 +00.497485 29.702936272 +7.9 5 2461228 0.3065692 +00.496986 29.686341185 +7.9 6 2461229 0.3066076 +00.496273 29.669794012 +7.9 7 2461230 0.3066131 +00.495347 29.653299396 +7.9 8 2461231 0.3065862 +00.494213 29.636862068 +7.9 9 2461232 0.3065272 +00.492872 29.620486854 +7.9 10 2461233 0.3064361 +00.491326 29.604178684 +7.9 11 2461234 0.3063128 +00.489573 29.587942579 +7.9 12 2461235 0.3061565 +00.487610 29.571783629 +7.9 13 2461236 0.3059667 +00.485433 29.555706953 +7.9 14 2461237 0.3057429 +00.483040 29.539717642 +7.9 15 2461238 0.3054849 +00.480429 29.523820712 +7.9 16 2461239 0.3051931 +00.477602 29.508021065 +7.9 17 2461240 0.3048681 +00.474563 29.492323472 +7.9 18 2461241 0.3045106 +00.471318 29.476732575 +7.9 19 2461242 0.3041211 +00.467870 29.461252895 +7.9 20 2461243 0.3037002 +00.464224 29.445888855 +7.9 21 2461244 0.3032484 +00.460381 29.430644790 +7.9 22 2461245 0.3027657 +00.456345 29.415524964 +7.8 23 2461246 0.3022525 +00.452117 29.400533578 +7.8 24 2461247 0.3017087 +00.447697 29.385674778 +7.8 25 2461248 0.3011344 +00.443086 29.370952660 +7.8 26 2461249 0.3005295 +00.438284 29.356371273 +7.8 27 2461250 0.2998940 +00.433291 29.341934628 +7.8 28 2461251 0.2992278 +00.428106 29.327646705 +7.8 29 2461252 0.2985312 +00.422731 29.313511459 +7.8 30 2461253 0.2978042 +00.417166 29.299532836 +7.8 31 2461254 0.2970472 +00.411414 29.285714782 +7.8 xx 2461255 0.2962606 +00.405478 29.272061257 +7.8 xx 2461256 0.2954452 +00.399361 29.258576248 +7.8 xx JD12_TT RA_Hr Decl_Deg Dist_AU VMag Day ===========================================================================
Programmed in PHP by Jay Tanner - 2026 - v4.0