Daily Sunspot Evaluation
Observation Sheet Thursday, 22 February 1973
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)
- 3
- Number of spots (f)
- 10
- Relative number (R)
- 40
- Observer
- HM
- Reading
- all checks consistent
- File
- 19730222.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | A – 2 | -19 | 51E | 182 | 35 | ||
| 2 | C – 6 | -16 | 29W | 262 | 35 | ||
| 3 | J – 2 | -16 | 75W | 308 | 25 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.