Daily Sunspot Evaluation
Observation Sheet Thursday, 20 July 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)
- 6
- Number of spots (f)
- 35
- Relative number (R)
- 95
- Observer
- ED
- Reading
- all checks consistent
- File
- 19720720.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | B – 4 | -12 | 05W | 220 | |||
| 2 | H – 14 | -9 | 12W | 227 | |||
| 3 | A – 1 | -22 | 47W | 262 | |||
| 4 | H – 3 | -10 | 25W | 240 | |||
| 5 | J – 5 | 9 | 30W | 245 | |||
| 6 | D – 8 | 13 | 19W | 234 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.