meteoblue Astronomy Seeing

meteoblue's Astronomy Seeing page is for observers who need to know more than the chance of cloud. Low, middle and high cloud are shown separately, because thin or overlapping layers can obscure the sky in ways that one total percentage hides. Two seeing indices estimate the effects of atmospheric turbulence, accompanied by arc-second values, jet-stream speed and the heights of especially unstable layers. Planet positions are folded into the table, making the page a compact technical briefing for the next few nights.

The documentation also prevents a common reading error: seeing describes steadiness in a clear portion of air and does not include cloud. A perfect seeing value beneath complete overcast is therefore possible and useless. Fog and very low cloud require another forecast, and local topography can depart from the model. The free worldwide horizon is shorter than the paid extension, but the geographic reach makes meteoblue especially useful outside the specialist North American services. Planetary observers and high-resolution imagers will get more from its turbulence detail than casual naked-eye stargazers.