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Astron. Astrophys. 325, 1174-1178 (1997)

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7. Conclusion

It may be concluded from the present investigation that the available measurements of the solar diameter, which extend from the 17th century to the present day, reveal no evidence of any secular variation. However, the presence of shorter term fluctuations cannot be ruled out. A further result of this paper is that the mean solar semi-diameter at 1 AU over the past 300 years is 960".0 [FORMULA] 0".1. On the question of the constancy of the solar diameter, the remark made by Lalande (1792) seems particularly relevant today: " Quoi qu'on ait trouvé le diamètre du Soleil de plus en plus petit depuis un siècle, je ne crois pas qu'il ait réellement diminué."

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© European Southern Observatory (ESO) 1997

Online publication: April 28, 1998

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