Daily Sunspot Evaluation
Observation Sheet Friday, 15 December 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)
- 5
- Number of spots (f)
- 23
- Relative number (R)
- 73
- Observer
- FA
- Reading
- all checks consistent
- File
- 19721215.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | J – 1 | 20 | 03E | 58 | |||
| 2 | E – 13 | -18 | 01E | 60 | |||
| 3 | B – 5 | -19 | 38W | 99 | |||
| 4 | J – 2 | 12 | 56W | 117 | |||
| 5 | H – 2 | 11 | 45W | 106 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.