Daily Sunspot Evaluation
Observation Sheet Tuesday, 21 July 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)
- 9
- Number of spots (f)
- 75
- Relative number (R)
- 165
- Observer
- MA
- Reading
- all checks consistent
- File
- 19700721.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | ? – 2 | 22 | 88E | 43 | |||
| 2 | ? – 1 | 18 | 85E | 46 | |||
| 3 | F – 42 | 8 | 40E | 91 | |||
| 4 | J – 2 | -15 | 19E | 112 | |||
| 5 | B – 2 | -8 | 08E | 123 | |||
| 6 | J – 7 | -10 | 25W | 156 | |||
| 7 | J – 1 | -19 | 69W | 200 | |||
| 8 | A – 10 | 17 | 70W | 201 | |||
| 9 | G – 8 | 15 | 05W | 136 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.