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Table 2
Solar radius observations in arcsec (′′) at one astronomical unit (AU).
| Instrument, site, authors | Years | Solar radius [′′] | λ [nm] |
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| Solar Astrolabe, Calern (Fr), Laclare et al. (1999) | 1975–1998 | 959.51 ± 0.01 * | 540.0 |
| SDM, Boulder (US), Brown & Christensen-Dalsgaard (1998) | 1981–1987 | 959.65 ± 0.01 ** | 800.0 |
| SDS, Balloon experiment (mean value), Sofia et al. (2013) | 1992–2011 | 959.76 ± 0.01 | 615.0 |
| DORAYSOL, Calern (Fr), Morand et al. (2010) | 1999–2006 | 959.48 ± 0.01 * | 548.0 |
| SoHO-MDI, in space (Transit of Mercury), Emilio et al. (2012) | 2003, 2006 | 960.12 ± 0.09 | 676.78 |
| Picard-SODISM, in space (Transit of Venus), Meftah et al. (2014a) | 2012 | 959.86 ± 0.20 | 607.1 |
| SDO-HMI, in space (Transit of Venus), Hauchecorne et al. (2014) | 2012 | 959.90 ± 0.06 | 617.3 |
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