Daily Sunspot Evaluation
Observation Sheet Monday, 21 May 1973
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)
- 3
- Number of spots (f)
- 37
- Relative number (R)
- 67
- Observer
- HM
- Reading
- all checks consistent
- File
- 19730521.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | H – 33 | 11 | 00° | 151 | 32 | ||
| 2 | A – 3 | -13 | 46°W | 197 | 37 | ||
| 3 | A – 1 | 15 | 75°W | 226 | 34 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.