Daily Sunspot Evaluation
Observation Sheet Thursday, 18 December 1969
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)
- 6
- Number of spots (f)
- 58
- Relative number (R)
- 118
- Observer
- TY
- Reading
- counts consistent, some coordinates doubtful
- File
- 19691218.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | J – 1 | 12 | 06E | 80 | |||
| 2 | D – 20 | 13 | 24E | 62 | |||
| 3 | ? – 2 | 12 | 77E | 9 | |||
| 4 | A – 1 | -14 | 24E | 62 | |||
| 5 | C – 33 | -13 | 04W | 80 ⚠ | |||
| 6 | J – 1 | 7 | 05W | 91 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.