Daily Sunspot Evaluation
Observation Sheet Monday, 21 February 1972
There is no typed record for this day. The values below were read by computer from the table on the sheet; when in doubt, see the drawing. Details →
- Number of groups (g)
- 7
- Number of spots (f)
- 59
- Relative number (R)
- 129
- Observer
- FA
- Reading
- counts consistent, some coordinates doubtful
- File
- 19720221.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | F – 36 | 10 | 17E | 13 ⚠ | |||
| 2 | G – 10 | -18 | 52E | 344 | |||
| 3 | H – 3 | -18 | 02W | 38 | |||
| 4 | J – 4 | -13 | 11W | 47 | |||
| 5 | C – 4 | -19 | 56W | 92 | |||
| 6 | A – 1 | -10 | 26W | 62 | |||
| 7 | J – 1 | -7 | 26W | 62 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.