Fig. 2


Download original image

Left: part of a drawing made at Locarno, showing that the spot with penumbra designated 104 was counted three times (weight 3); the inset shows the same spot from Mt. Wilson. Right: two spots with the same area on drawings from Mt. Wilson and counted with weight 1 by Wolfer, in each case as one group with one spot (Wolf’s notation: groups.spots = 1.1), as the group was the only group on the disk.

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.