Daily Sunspot Evaluation
Observation Sheet Tuesday, 21 May 1957
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)
- 17
- Number of spots (f)
- 105
- Relative number (R)
- 275
- Observer
- ET
- Reading
- all checks consistent
- File
- 19570521.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | ? – 3 | 21 | 79E | ||||
| 2 | D – 13 | 14 | 47E | ||||
| 3 | C – 6 | -11 | 66E | ||||
| 4 | C – 8 | -11 | 39E | ||||
| 5 | A – 2 | -22 | 68E | ||||
| 6 | A – 1 | -28 | 8W | ||||
| 7 | B – 8 | -22 | 15W | ||||
| 8 | A – 11 | -13 | 10W | ||||
| 9 | D – 19 | -17 | 28W | ||||
| 10 | J – 1 | -14 | 35W | ||||
| 11 | A – 1 | -19 | 42W | ||||
| 12 | J – 1 | -12 | 49W | ||||
| 13 | A – 3 | -8 | 59W | ||||
| 14 | J – 1 | 20 | 71W | ||||
| 15 | A – 1 | 18 | 62W | ||||
| 16 | C – 4 | 27 | 67W | ||||
| 17 | E – 22 | 7 | 6W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.