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Fig. 1

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Left: solar radius measurements (red symbols) made since the seventeenth century (Rozelot & Damiani 2012). The mean value of all these measurements is close to 960 arcsec. Right: focus on solar radius measurements made since 1970. Solar Disk Sextant (SDS) measurements (Sofia et al. 2013) are represented with black circles. Solar and Heliospheric Observatory – Michelson Doppler Imager (SoHo-MDI) and Solar Dynamics Observatory – Helioseismic and Magnetic Imager (SDO-HMI) records are represented with blue symbols. The Solar Diameter Imager and Surface Mapper (SODISM) measurement obtained during the transit of Venus is represented with a green symbol. Adassuriya et al. (2011) found a solar radius of 959.89 ± 0.18 arcsec (see magenta circle symbol) during solar eclipse in Sri Lanka.

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