Istanbul University Faculty of Science

SOLAR OBSERVATIONS

Istanbul University Observatory · Sunspot observations since 1950

Observatory

Feyza Birsen Akkaya Yapulu Observer record

← All observers
FA
Staff
659
Observation days
9
Years with observations
73.2
Mean days / year
119
Best year (1976)
14.05.1970
24.04.1978
First / last observation

1970 46 days

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May 2
Jun 3
Jul 6
Aug 9
Sep 8
Oct 7
Nov 6
Dec 5

1971 72 days

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Jan 4
Feb 5
Mar 7
Apr 7
May 6
Jun 8
Jul 3
Aug 6
Sep 4
Oct 4
Nov 7
Dec 11

1972 60 days

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Jan 5
Feb 6
Mar 7
Apr 6
May 6
Jul 8
Aug 4
Sep 9
Oct 5
Nov 2
Dec 2

1973 35 days

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Jan 1
Feb 2
Aug 1
Sep 6
Oct 7
Nov 11
Dec 7

1974 88 days

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Jan 2
Feb 3
Mar 3
Apr 5
May 7
Jun 8
Jul 11
Aug 6
Sep 12
Oct 14
Nov 9
Dec 8

1975 104 days

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Jan 8
Feb 5
Mar 8
Apr 7
May 7
Jun 10
Jul 14
Aug 8
Sep 7
Oct 13
Nov 10
Dec 7

1976 119 days

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Jan 15
Feb 6
Mar 11
Apr 7
May 17
Jun 10
Jul 15
Aug 2
Sep 11
Oct 9
Nov 6
Dec 10

1977 108 days

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Jan 9
Feb 4
Mar 10
Apr 8
May 14
Jun 5
Jul 12
Aug 7
Sep 10
Oct 9
Nov 12
Dec 8

1978 27 days

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Jan 4
Feb 3
Mar 10
Apr 10