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Definitive or provisional value / Valeur définitive ou provisoire
3,306
1
5
0
Monthly mean total sunspot number
67
0.0
10
0.4
9
18.3
9
41.7
9
50.0
9
73.3
8
0.8
8
1.2
8
8.5
8
9.5
8
13.2
8
13.3
8
16.7
8
22.5
8
33.3
8
83.3
7
4.0
7
6.7
7
10.0
7
13.9
7
14.0
7
17.9
7
18.7
7
20.5
7
21.2
7
44.5
7
78.6
6
0.6
6
1.5
6
5.0
6
7.3
6
11.2
6
13.1
6
13.7
6
20.0
6
20.8
6
23.3
6
29.6
6
35.7
6
40.0
6
48.8
6
52.5
6
63.3
6
71.7
6
75.0
6
80.5
6
85.0
6
90.4
5
0.5
5
1.7
5
2.5
5
2.8
5
2.9
5
4.6
5
4.9
5
5.3
5
5.5
5
5.9
5
7.0
5
7.5
5
7.7
5
8.2
5
9.8
5
11.0
5
11.3
5
12.6
5
12.9
5
15.7
5
17.2
5
18.5
5
18.8
5
19.2
5
19.3
5
20.4
5
21.6
5
21.7
5
22.0
5
24.5
5
29.7
5
32.0
5
32.4
5
34.3
5
34.5
5
39.7
5
43.7
5
45.7
5
47.5
5
47.9
5
48.3
5
57.5
5
60.0
5
60.9
5
64.5
5
65.0
5
66.7
5
74.2
5
74.6
5
76.2
5
76.7
5
80.0
More
Less
Monthly mean / Moyenne mensuelle
828
-1
238
3
226
2
225
8
217
5
200
9
199
7
192
4
192
10
186
6
131
11
113
12
83
13
49
15
47
14
44
16
30
0
30
1
23
17
22
18
15
19
8
20
4
21
4
23
3
22
1
24
1
29
More
Less
Number of observations / Nombre d'observations
943
31
828
-1
549
30
123
28
52
29
28
25
25
27
22
20
22
22
20
19
18
15
16
18
16
23
15
21
15
24
15
26
14
16
12
14
9
11
9
17
8
13
7
12
5
8
5
10
5
566
5
628
4
429
4
487
4
493
4
536
4
551
4
562
4
586
4
605
4
623
4
630
4
706
3
397
3
468
3
479
3
486
3
490
3
500
3
501
3
509
3
511
3
518
3
537
3
539
3
543
3
546
3
567
3
594
3
607
3
619
3
620
3
637
3
661
3
691
3
1215
2
7
2
9
2
244
2
268
2
308
2
361
2
363
2
399
2
404
2
415
2
417
2
419
2
422
2
431
2
434
2
437
2
442
2
446
2
465
2
469
2
475
2
477
2
480
2
502
2
505
2
507
2
515
2
516
2
521
2
525
2
530
2
532
2
534
2
535
2
544
2
550
2
559
2
564
2
569
2
571
More
Less
Date (month) / Date (mois)
From
to
12
1749
12
1750
12
1751
12
1752
12
1753
12
1754
12
1755
12
1756
12
1757
12
1758
12
1759
12
1760
12
1761
12
1762
12
1763
12
1764
12
1765
12
1766
12
1767
12
1768
12
1769
12
1770
12
1771
12
1772
12
1773
12
1774
12
1775
12
1776
12
1777
12
1778
12
1779
12
1780
12
1781
12
1782
12
1783
12
1784
12
1785
12
1786
12
1787
12
1788
12
1789
12
1790
12
1791
12
1792
12
1793
12
1794
12
1795
12
1796
12
1797
12
1798
12
1799
12
1800
12
1801
12
1802
12
1803
12
1804
12
1805
12
1806
12
1807
12
1808
12
1809
12
1810
12
1811
12
1812
12
1813
12
1814
12
1815
12
1816
12
1817
12
1818
12
1819
12
1820
12
1821
12
1822
12
1823
12
1824
12
1825
12
1826
12
1827
12
1828
12
1829
12
1830
12
1831
12
1832
12
1833
12
1834
12
1835
12
1836
12
1837
12
1838
12
1839
12
1840
12
1841
12
1842
12
1843
12
1844
12
1845
12
1846
12
1847
12
1848
More
Less
Monthly mean sunspot number since 1749 (taches solaires) - SILSO data, Royal Observatory of Belgium, Brussels
Information
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Daily sunspot number
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Date (month) / Date (mois)
Date in fraction of year / Date en fraction de l'année
Monthly mean total sunspot number
Monthly mean / Moyenne mensuelle
Number of observations / Nombre d'observations
Definitive or provisional value / Valeur définitive ou provisoire
Date (month) / Date (mois)
Date in fraction of year / Date en fraction de l'année
Monthly mean total sunspot number
Monthly mean / Moyenne mensuelle
Number of observations / Nombre d'observations
Definitive or provisional value / Valeur définitive ou provisoire
1
January 1749
1,749.042
96.7
-1
-1
1
2
February 1749
1,749.123
104.3
-1
-1
1
3
March 1749
1,749.204
116.7
-1
-1
1
4
April 1749
1,749.288
92.8
-1
-1
1
5
May 1749
1,749.371
141.7
-1
-1
1
6
June 1749
1,749.455
139.2
-1
-1
1
7
July 1749
1,749.538
158
-1
-1
1
8
August 1749
1,749.623
110.5
-1
-1
1
9
September 1749
1,749.707
126.5
-1
-1
1
10
October 1749
1,749.79
125.8
-1
-1
1
11
November 1749
1,749.874
264.3
-1
-1
1
12
December 1749
1,749.958
142
-1
-1
1
13
January 1750
1,750.042
122.2
-1
-1
1
14
February 1750
1,750.123
126.5
-1
-1
1
15
March 1750
1,750.204
148.7
-1
-1
1
16
April 1750
1,750.288
147.2
-1
-1
1
17
May 1750
1,750.371
150
-1
-1
1
18
June 1750
1,750.455
166.7
-1
-1
1
19
July 1750
1,750.538
142.3
-1
-1
1
20
August 1750
1,750.623
171.7
-1
-1
1
21
September 1750
1,750.707
152
-1
-1
1
22
October 1750
1,750.79
109.5
-1
-1
1
23
November 1750
1,750.874
105.5
-1
-1
1
24
December 1750
1,750.958
125.7
-1
-1
1
25
January 1751
1,751.042
116.7
-1
-1
1
26
February 1751
1,751.123
72.5
-1
-1
1
27
March 1751
1,751.204
75.5
-1
-1
1
28
April 1751
1,751.288
94
-1
-1
1
29
May 1751
1,751.371
101.2
-1
-1
1
30
June 1751
1,751.455
84.5
-1
-1
1
31
July 1751
1,751.538
110.5
-1
-1
1
32
August 1751
1,751.623
99.7
-1
-1
1
33
September 1751
1,751.707
39.2
-1
-1
1
34
October 1751
1,751.79
38.7
-1
-1
1
35
November 1751
1,751.874
47.5
-1
-1
1
36
December 1751
1,751.958
73.3
-1
-1
1
37
January 1752
1,752.042
58.3
-1
-1
1
38
February 1752
1,752.124
83.3
-1
-1
1
39
March 1752
1,752.206
118.3
-1
-1
1
40
April 1752
1,752.29
98.8
-1
-1
1
41
May 1752
1,752.373
99.5
-1
-1
1
42
June 1752
1,752.456
66
-1
-1
1
43
July 1752
1,752.54
130.7
-1
-1
1
44
August 1752
1,752.624
48.8
-1
-1
1
45
September 1752
1,752.708
45.2
-1
-1
1
46
October 1752
1,752.791
77.7
-1
-1
1
47
November 1752
1,752.874
62.7
-1
-1
1
48
December 1752
1,752.958
66.7
-1
-1
1
49
January 1753
1,753.042
73.3
-1
-1
1
50
February 1753
1,753.123
53.3
-1
-1
1
51
March 1753
1,753.204
76.2
-1
-1
1
52
April 1753
1,753.288
63.3
-1
-1
1
53
May 1753
1,753.371
60
-1
-1
1
54
June 1753
1,753.455
52.8
-1
-1
1
55
July 1753
1,753.538
36.7
-1
-1
1
56
August 1753
1,753.623
65
-1
-1
1
57
September 1753
1,753.707
46.7
-1
-1
1
58
October 1753
1,753.79
41.7
-1
-1
1
59
November 1753
1,753.874
33.3
-1
-1
1
60
December 1753
1,753.958
11.2
-1
-1
1
61
January 1754
1,754.042
0
-1
-1
1
62
February 1754
1,754.123
5
-1
-1
1
63
March 1754
1,754.204
2.8
-1
-1
1
64
April 1754
1,754.288
22.8
-1
-1
1
65
May 1754
1,754.371
34.5
-1
-1
1
66
June 1754
1,754.455
44.5
-1
-1
1
67
July 1754
1,754.538
31.3
-1
-1
1
68
August 1754
1,754.623
20.5
-1
-1
1
69
September 1754
1,754.707
13.7
-1
-1
1
70
October 1754
1,754.79
40.2
-1
-1
1
71
November 1754
1,754.874
22
-1
-1
1
72
December 1754
1,754.958
7
-1
-1
1
73
January 1755
1,755.042
17
-1
-1
1
74
February 1755
1,755.123
18.7
-1
-1
1
75
March 1755
1,755.204
11.3
-1
-1
1
76
April 1755
1,755.288
10.8
-1
-1
1
77
May 1755
1,755.371
0
-1
-1
1
78
June 1755
1,755.455
0
-1
-1
1
79
July 1755
1,755.538
14.3
-1
-1
1
80
August 1755
1,755.623
5.3
-1
-1
1
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