Daily Sunspot Evaluation
Observation Sheet Friday, 18 February 1977
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)
- 6
- Relative number (R)
- 36
- Observer
- GA
- Reading
- all checks consistent
- File
- 19770218.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | J – 1 | -20 | 23E | 54 | 23E | ||
| 2 | ? – 3 | -42 | 76W | 156 | 76W | ||
| 3 | A – 2 | 21 | 61W | 141 | 61W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.