Daily Sunspot Evaluation
Observation Sheet Thursday, 20 July 1978
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)
- 37
- Relative number (R)
- 97
- Observer
- GT
- Reading
- all checks consistent
- File
- 19780720.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | B – 6 | -39 | 23W | 120 | 26W | ||
| 2 | J – 2 | -24 | 25W | 122 | 28W | ||
| 3 | C – 5 | 11 | 40W | 137 | 43W | ||
| 4 | J – 2 | 11 | 33W | 130 | 36W | ||
| 5 | J – 12 | 17 | 70W | 169 | 73W | ||
| 6 | B – 10 | 18 | 16W | 113 | 19W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.