Daily Sunspot Evaluation
Observation Sheet Sunday, 16 September 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)
- 4
- Number of spots (f)
- 10
- Relative number (R)
- 50
- Observer
- HM
- Reading
- all checks consistent
- File
- 19730916.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | J – 3 | 14 | 66E | 325 | 170 | ||
| 2 | A – 3 | -8 | 44E | 347 | 174 | ||
| 3 | A – 2 | -4 | 16E | 15 | 173 | ||
| 4 | A – 2 | 13 | 20W | 51 | 172 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.