Published online by Cambridge University Press: 05 January 2006
We present results of daytime site testing at Dome C in summer2003–2004. Daytime seeing has been monitored during 2$\frac{1}{2}$months using a DIMM on the bright star Canopus, giving median value of0.54 arcsec. An every-day best seeing period has been observed around5 pm with seeing around 0.3 arcsec. First isoplanatic anglemeasurements, based on stellar scintillation, were also performedduring the month of January 2004, and have given median value of 6.8 arcsec.