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astro-ph.SR2013★ 2 cited
A cycle of measurements of the solar semidiameter with the astrolabe of Rio de Janeiro (1998-2009)
Sérgio Calderari Boscardin
The solar astrolabe at Observatorio Nacional has been doing a series of solar semidiameter measurements, extending from 1998 up to 2009, to a total of 21640 observations of the Sun…
astro-ph.SR2013
Diameter and solar figure observations in the solar activity context with the astrolabe of Rio de Janeiro in 1998-2003
Sérgio Calderari Boscardin
From 1998 to 2003 the CCD Solar Astrolabe of the Observatorio Nacional in Rio de Janeiro made more than 20000 observations of the Solar Semidiameter. In the present work similar co…
astro-ph.SR2013
Analysis of a series of measurements of solar semidiameter variations during 2001 at the astrolabe of Rio de Janeiro
Sérgio Calderari Boscardin
From 1997 the Observatorio Nacional has been observing the Sun with an astrolabe in order to study variations on the solar semi-diameter. Till now more than 20.000 observations wer…