A penumbral lunar eclipse took place on Thursday, January 18, 1973, the first of four lunar eclipses in 1973, the second being with a penumbral lunar eclipse on Friday, June 15, the third being with a penumbral lunar eclipse on Sunday, July 15, and the last being with a partial lunar eclipse on Monday, December 10.[1]
| Penumbral eclipse | |||||||||
| Date | 18 January 1973 | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Gamma | −1.08446 | ||||||||
| Magnitude | 0.86555 | ||||||||
| Saros cycle | 143 (16 of 73) | ||||||||
| Penumbral | 236 minutes, 33.7 seconds | ||||||||
| |||||||||
Visibility
Relation to other lunar eclipses
Eclipses in 1973
- An annular solar eclipse on Thursday, 4 January 1973.
- A penumbral lunar eclipse on Thursday, 18 January 1973.
- A penumbral lunar eclipse on Friday, 15 June 1973.
- A total solar eclipse on Saturday, 30 June 1973.
- A penumbral lunar eclipse on Sunday, 15 July 1973.
- A partial lunar eclipse on Monday, 10 December 1973.
- An annular solar eclipse on Monday, 24 December 1973.
Lunar year series
| Lunar eclipse series sets from 1969–1973 | ||||||||
|---|---|---|---|---|---|---|---|---|
| Ascending node | Descending node | |||||||
| Saros | Date Viewing | Type Chart | Gamma | Saros | Date Viewing | Type Chart | Gamma | |
| 108 | 1969 Aug 27 | Penumbral | −1.54066 | 113 | 1970 Feb 21 | Partial | 0.96198 | |
| 118 | 1970 Aug 17 | Partial | −0.80534 | 123 | 1971 Feb 10 | Total | 0.27413 | |
| 128 | 1971 Aug 06 | Total | −0.07944 | 133 | 1972 Jan 30 | Total | −0.42729 | |
| 138 | 1972 Jul 26 | Partial | 0.71167 | 143 | 1973 Jan 18 | Penumbral | −1.08446 | |
| 148 | 1973 Jul 15 | Penumbral | 1.51782 | |||||
| Last set | 1969 Sep 25 | Last set | 1969 Apr 02 | |||||
| Next set | 1973 Jun 15 | Next set | 1973 Dec 10 | |||||
Half-Saros cycle
A lunar eclipse will be preceded and followed by solar eclipses by 9 years and 5.5 days (a half saros).[2] This lunar eclipse is related to two partial solar eclipses of Solar Saros 150.
| January 14, 1964 | January 25, 1982 |
|---|---|
 |  |
See also
Notes
External links
- 1973 Jan 18 chart Eclipse Predictions by Fred Espenak, NASA/GSFC