Besselian
Elements: Total Solar Eclipse of 2017 Aug 21
2017 Aug 21 at 18:00:00.0 TD (=t0)
| n |
x |
y |
d |
l1 |
l2 |
μ |
| 0 |
-0.12958 |
0.48542 |
11.8670 |
0.54211 |
-0.00403 |
89.2454 |
| 1 |
0.54064 |
-0.14164 |
-0.0136 |
0.00012 |
0.00012 |
15.0039 |
| 2 |
-0.00003 |
-0.00009 |
-0.0000 |
-0.00001 |
-0.00001 |
0.0000 |
| 3 |
-0.00001 |
0.00000 |
- |
- |
- |
- |
| Tan ƒ1 |
0.0046222 |
| Tan ƒ2 |
0.0045992 |
At time t1 (decimal hours), each besselian element is evaluated by:
x = x0 + x1*t + x2*t2 + x3*t3 (or x = Σ [xn*tn]; n = 0 to 3)
where: t = t1 - t0 (decimal hours) and t0 = 18.000
| Eclipse Characteristics |
| Parameter |
Value |
| Eclipse Magnitude |
1.03059 |
| Eclipse Obscuration |
1.06211 |
| Gamma |
0.43671 |
| Conjunction Times |
| Event |
Calendar Date & Time |
Julian Date |
| Greatest Eclipse |
2017 Aug 21 at 18:26:40.3 TD (18:25:31.7 UT1) |
2457987.267728 |
| Ecliptic Conjunction |
2017 Aug 21 at 18:31:19.6 TD (18:30:11.0 UT1) |
2457987.270961 |
| Equatorial Conjunction |
2017 Aug 21 at 18:14:22.8 TD (18:13:14.3 UT1) |
2457987.259193 |
| Geocentric Coordinates of Sun and Moon |
| 2017 Aug 21 at 18:26:40.3 TD (18:25:31.7 UT1) |
| Coordinate |
Sun |
Moon |
| Right Ascension |
10h04m03.9s |
10h04m30.6s |
| Declination |
+11°51'43.0" |
+12°16'32.8" |
| Semi-Diameter |
15'48.7" |
16'03.4" |
| Eq. Hor. Parallax |
08.7" |
0°58'55.7" |
| Geocentric Libration of Moon |
| Angle |
Value |
| l |
4.6° |
| b |
-0.6° |
| c |
21.9° |
| Prediction Paramaters |
| Paramater |
Value |
| Ephemerides |
JPL DE406 |
| ΔT |
68.5 s |
| k (penumbra) |
0.2725076 |
| k (umbra) |
0.2722810 |
| Saros Series |
145 (22/77) |
| Greatest Eclipse and Greatest Duration |
| Event |
Time
TD |
Time
UT1 |
Latitude |
Longitude |
Sun
Altitude |
Sun
Azimuth |
Path Width |
Central
Duration |
| Greatest Eclipse |
18:26:40.3 |
18:25:31.7 |
36°58.0'N |
087°57.5'W |
63.9° |
197.9° |
114.7 km |
02m40.12s |
| Greatest Duration |
18:22:57.6 |
18:21:49.0 |
37°34.6'N |
089°06.6'W |
63.8° |
192.5° |
114.5 km |
02m40.25s |
