Daily Sunspot Evaluation
Observation Sheet Tuesday, 16 April 1968
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)
- 8
- Number of spots (f)
- 25
- Relative number (R)
- 105
- Observer
- AT
- Reading
- all checks consistent
- File
- 19680416.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | J – 1 | 22 | 9°E | 226 | |||
| 2 | A – 1 | 24 | 68E | 169 | |||
| 3 | J – 1 | 25 | 59E | 176 | |||
| 4 | J – 1 | -12 | 56E | 179 | |||
| 5 | A – 1 | -22 | 26E | 209 | |||
| 6 | C – 5 | -11 | 46W | 281 | |||
| 7 | J – 5 | 23 | 51W | 286 | |||
| 8 | E – 10 | 25 | 15W | 250 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.