The following table contains the Besselian elements for the Partial Solar Eclipse of 2025 Sep 21 .
The global visibility of the eclipse is shown on an Orthographic Map .
Besselian Elements for the Partial Solar Eclipse of 2025 Sep 21
Non-Central Eclipse
Equatorial Conjunction: 20:51:38.2 TDT J.D. = 2460940.369193
(Sun & Moon in R.A.) (=20:50:27.1 UT)
Ecliptic Conjunction: 19:55:17.0 TDT J.D. = 2460940.330057
(Sun & Moon in Ec. Lo.) (=19:54:05.8 UT)
Instant of 19:43:03.9 TDT J.D. = 2460940.321573
Greatest Eclipse: (=19:41:52.8 UT)
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Gamma = -1.0650 Ephemerides = VSOP87/ELP2000-85
Eclipse Magnitude = 0.8551 Lunation No. = 318
ΔT = 71.1 s Saros Series = 154 ( 7/71)
Lunar Radius k1 = 0.272488 (Penumbra) Shift in Δb = 0.00"
Constants: k2 = 0.272281 (Umbra) Lunar Position: Δl = 0.00"
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Geocentric Coordinates of Sun & Moon at Greatest Eclipse (VSOP87/ELP2000-85):
Sun: R.A. = 11h56m36.9s Moon: R.A. = 11h54m42.8s
Dec. =+00°22'00.7" Dec. =-00°29'14.6"
Semi-Diameter = 15'55.9" Semi-Diameter = 15'02.8"
Eq.Hor.Par. = 08.8" Eq.Hor.Par. = 0°55'13.2"
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Polynomial Besselian Elements for: 2025 Sep 21 20:00:00.0 TDT (=t0)
n x y d l1 l2 μ
0 -0.390002 -1.001816 0.36472 0.562492 0.016273 121.78191
1 0.4531641 -0.2521622 -0.015600 0.0000909 0.0000905 15.004772
2 0.0000024 0.0000456 -0.000000 -0.0000102 -0.0000102
3 -0.0000064 0.0000032
Tan ƒ1 = 0.0046583 Tan ƒ2 = 0.0046351
At time t1 (decimal hours), each Besselian element is evaluated by:
a = a0 + a1*t + a2*t^2 + a3*t^3 (or a = Σ [an*t^n]; n = 0 to 3)
where: a = x, y, d, l1, l2, or μ
t = t1 - t0 (decimal hours) and t0 = 20.000 TDT
The Besselian elements were derived from a least-squares fit to elements
calculated at five uniformly spaced times over a six hour period centered at t0.
The Besselian elements are valid over the period 17.00 ≤ t0 ≤ 23.00 TDT.
Note that all times are expressed in Terrestrial Dynamical Time (TDT).
Saros Series 154: Member 7 of 71 eclipses in series.
Predictions for the Partial Solar Eclipse of 2025 Sep 21 were generated using the VSOP87/ELP2000-85 solar and lunar ephemerides and a value of ΔT = 71.1 seconds. The luanr coordinates have been calculated with respect to the Moon's Center of Mass. They DO NOT include a correction to the Center of Figure, or the effects of mountains and valleys along the edge of the Moon.
All eclipse calculations are by Fred Espenak, and he assumes full responsibility for their accuracy. Permission is freely granted to reproduce this data when accompanied by an acknowledgment:
"Eclipse Predictions by Fred Espenak, NASA's GSFC"
For more information, see: NASA Copyright Information
