Daily Sunspot Evaluation
Observation Sheet Wednesday, 20 May 1970
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)
- 11
- Number of spots (f)
- 131
- Relative number (R)
- 241
- Observer
- MA
- Reading
- all checks consistent
- File
- 19700520.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | H – 13 | 15 | 30E | 201 | |||
| 2 | A – 3 | 5 | 14E | 217 | |||
| 3 | A – 3 | 15 | 64E | 167 | |||
| 4 | C – 7 | -8 | 21E | 210 | |||
| 5 | C – 16 | -11 | 09W | 240 | |||
| 6 | G – 4 | -16 | 73W | 304 | |||
| 7 | J – 4 | -12 | 44W | 275 | |||
| 8 | ? – 8 | -8 | 75W | 306 | |||
| 9 | J – 1 | -8 | 50W | 281 | |||
| 10 | J – 2 | 18 | 69W | 300 | |||
| 11 | F – 70 | 18 | 26W | 257 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.