Daily Sunspot Evaluation
Observation Sheet Thursday, 28 June 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)
- 4
- Number of spots (f)
- 21
- Relative number (R)
- 61
- Observer
- SK
- Reading
- all checks consistent
- File
- 19730628.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | B – 2 | -5 | 07E | 2 | 426 | ||
| 2 | C – 10 | -12 | 35W | 44 | 420 | ||
| 3 | H – 7 | -7 | 58W | 67 | 417 | ||
| 4 | J – 2 | -2 | 45W | 54 | 413 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.