Daily Sunspot Evaluation
Observation Sheet Friday, 18 May 1973
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)
- 4
- Number of spots (f)
- 20
- Relative number (R)
- 60
- Observer
- HM
- Reading
- all checks consistent
- File
- 19730518.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | J – 1 | 12 | 36°E | 154 | 39 | ||
| 2 | H – 15 | 9 | 42°E | 148 | 33 | ||
| 3 | A – 1 | -8 | 37°E | 153 | 30 | ||
| 4 | J – 3 | -10 | 10°W | 200 | 27 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.