Daily Sunspot Evaluation
Observation Sheet Thursday, 17 May 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)
- 26
- Relative number (R)
- 56
- Observer
- SK
- Reading
- all checks consistent
- File
- 19730517.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | J – 1 | 12 | 51°E | 153 | 99 | ||
| 2 | H – 12 | 9 | 57°E | 149 | 89 | ||
| 3 | B – 13 | -10 | 07°E | 197 | 87 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.