Daily Sunspot Evaluation
Observation Sheet Sunday, 20 July 1980
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)
- 14
- Number of spots (f)
- 120
- Relative number (R)
- 260
- Observer
- HM
- Reading
- all checks consistent
- File
- 19800720.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | CAI – 7 | 20 | 63W | 231 | 66W | 9 | |
| 2 | DAO – 6 | 7 | 16W | 184 | 19W | 3.5 | |
| 3 | CII – 6 | 20 | 02W | 170 | 05W | 8 | |
| 4 | CAI – 13 | 14 | 12E | 156 | 09E | 8.5 | |
| 5 | DAO – 9 | 27 | 18E | 150 | 15E | 5.5 | |
| 6 | DSI – 10 | 17 | 34E | 134 | 31E | 5.5 | |
| 7 | EKI – 19 | -12 | 40W | 208 | 43W | 11.5 | |
| 8 | ARX – 1 | -24 | 40W | 208 | 43W | - | |
| 9 | BAI – 11 | -26 | 29W | 197 | 32W | 4.5 | |
| 10 | HEX – 8 | -25 | 02W | 170 | 05W | 8.5 | |
| 11 | DKI – 16 | -20 | 11E | 157 | 08E | 7 | |
| 12 | CJO – 2 | -12 | 44E | 124 | 47E | 5 | |
| 13 | HKI – 11 | -19 | 52E | 116 | 49E | 5 | |
| 14 | AXX – 1 | -8 | 60E | 108 | 57E | - |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.