Daily Sunspot Evaluation
Observation Sheet Tuesday, 21 March 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)
- 70
- Relative number (R)
- 130
- Observer
- HM
- Reading
- all checks consistent
- File
- 19720321.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | D – 19 | 8 | 44E | 330 | |||
| 2 | C – 23 | -19 | 03W | 17 | |||
| 3 | A – 3 | -9 | 42W | 56 | |||
| 4 | B – 7 | -8 | 55W | 69 | |||
| 5 | ? – 3 | 4 | 82W | 96 | |||
| 6 | H – 15 | 9 | 13W | 27 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.