Daily Sunspot Evaluation
Observation Sheet Sunday, 21 May 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)
- 9
- Number of spots (f)
- 37
- Relative number (R)
- 127
- Observer
- GT
- Reading
- all checks consistent
- File
- 19780521.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | ? – 1 | 18 | 80E | 91 | 77E | ||
| 2 | C – 5 | -18 | 61E | 110 | 58E | ||
| 3 | C – 5 | -30 | 31E | 137 | 31E | ||
| 4 | B – 4 | -32 | 21E | 150 | 18E | ||
| 5 | J – 3 | -30 | 12W | 183 | 15W | ||
| 6 | D – 10 | -28 | 28W | 199 | 31W | ||
| 7 | J – 3 | 18 | 50W | 221 | 53W | ||
| 8 | H – 4 | 11 | 20W | 191 | 23W | ||
| 9 | J – 2 | 22 | 37W | 208 | 40W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.