Daily Sunspot Evaluation
Observation Sheet Monday, 20 July 1987
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)
- 2
- Number of spots (f)
- 13
- Relative number (R)
- 33
- Observer
- HG
- Reading
- all checks consistent
- File
- 19870720.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | CAI – 7 | -28 | 15E | 257 | 12E | 7.50 | 42 |
| 2 | HKX – 6 | -31 | 29E | 243 | 26E | 4.49 | 41 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.