Daily Sunspot Evaluation
Observation Sheet Sunday, 21 May 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)
- 4
- Number of spots (f)
- 52
- Relative number (R)
- 92
- Observer
- HM
- Reading
- all checks consistent
- File
- 19720521.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | A – 2 | -16 | 29E | 260 | |||
| 2 | F – 31 | -14 | 09W | 298 | |||
| 3 | C – 8 | -5 | 44W | 333 | |||
| 4 | H – 11 | 14 | 10W | 299 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.