Sunspot positions, areas, and group tilt angles for 1611−1631 from observations by Christoph Scheiner

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Table 1

Numbers of days available for given years as reported by Scheiner (1630), Scheiner (1651), and Reeves & Van Helden (2010).


Year	Days	Year	Days	Year	Days

1611	41^a	1622	17	1626	169^b
1612	31	1623	9	1627	55
1618	7	1624	40	1629	49^c
1621	27	1625	343^b	1631	12

Total	800

Notes.

^(a)

Five days were not analysed because of unreliable positional results.

^(b)

One day showed only faculae.

^(c)

Two days were omitted because groups were not drawn completely.

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