Daily Sunspot Evaluation
Observation Sheet Sunday, 21 August 1977
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)
- 3
- Number of spots (f)
- 21
- Relative number (R)
- 51
- Observer
- GT
- Reading
- all checks consistent
- File
- 19770821.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | ? – 13 | 18 | 72'W | 242 | 74'W | ||
| 2 | A – 4 | 19 | 32'W | 202 | 34'W | ||
| 3 | A – 4 | 27 | 44'W | 214 | 46'W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.