Daily Sunspot Evaluation
Observation Sheet Monday, 21 July 1958
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)
- 18
- Number of spots (f)
- 112
- Relative number (R)
- 292
- Observer
- SG
- Reading
- all checks consistent
- File
- 19580721.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | A – 3 | 20 | 3E | ||||
| 2 | B – 7 | 20 | 27E | ||||
| 3 | B – 5 | 18 | 73E | ||||
| 4 | J – 2 | 15 | 60E | ||||
| 5 | J – 2 | -5 | 61E | ||||
| 6 | ? – 10 | -18 | 72E | ||||
| 7 | H – 2 | -18 | 56E | ||||
| 8 | E – 24 | -15 | 28E | ||||
| 9 | B – 3 | -12 | 15E | ||||
| 10 | A – 1 | -21 | 33W | ||||
| 11 | A – 1 | -17 | 53W | ||||
| 12 | ? – 8 | -24 | 80W | ||||
| 13 | B – 3 | -13 | 63W | ||||
| 14 | J – 3 | -3 | 32W | ||||
| 15 | E – 21 | -8 | 39W | ||||
| 16 | A – 1 | 8 | 19W | ||||
| 17 | J – 1 | 18 | 82W | ||||
| 18 | B – 15 | 20 | 5W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.