Daily Sunspot Evaluation
Observation Sheet Tuesday, 21 May 1968
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)
- 8
- Number of spots (f)
- 140
- Relative number (R)
- 220
- Observer
- AT
- Reading
- counts consistent, some coordinates doubtful
- File
- 19680521.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | E – 58 | 20 | 28E | 105 | |||
| 2 | C – 4 | -8 | 63E | 70 | |||
| 3 | E – 24 | -16 | 28E | 110 ⚠ | |||
| 4 | B – 4 | -22 | 37E | 96 | |||
| 5 | E – 16 | -30 | 3W | 136 | |||
| 6 | B – 20 | -29 | 34W | 167 | |||
| 7 | J – 2 | 12 | 77W | 210 | |||
| 8 | C – 12 | 10 | 17W | 150 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.