Daily Sunspot Evaluation
Observation Sheet Friday, 20 July 1979
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)
- 10
- Number of spots (f)
- 121
- Relative number (R)
- 221
- Observer
- GT
- Reading
- all checks consistent
- File
- 19790720.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | C – 12 | 32 | 25E | 294 | 22E | 102 | |
| 2 | A – 1 | 32 | 48E | 271 | 45E | 106 | |
| 3 | G – 12 | 12 | 49E | 270 | 46E | 100 | |
| 4 | G – 22 | 3 | 15E | 304 | 12E | 96 | |
| 5 | C – 22 | -20 | 01E | 318 | 02W | 99 | |
| 6 | C – 6 | -28 | 35W | 354 | 38W | 93 | |
| 7 | C – 6 | -22 | 31W | 350 | 34W | 103 | |
| 8 | D – 23 | 15 | 33W | 352 | 36W | 104 | |
| 9 | B – 7 | 28 | 47W | 6 | 50W | 105 | |
| 10 | H – 10 | 30 | 15W | 334 | 18W | 92 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.