Daily Sunspot Evaluation
Observation Sheet Sunday, 20 January 1974
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)
- 7
- Relative number (R)
- 47
- Observer
- HM
- Reading
- all checks consistent
- File
- 19740120.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | A – 1 | -11 | 10W | 179 | |||
| 2 | J – 1 | -18 | 24W | 193 | |||
| 3 | A – 1 | -15 | 49W | 218 | |||
| 4 | A – 4 | 5 | 28W | 197 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.