Abstract
Direct measurements of atmospheric precipitable water vapour are presented for Zelenchukskaya at the site of the 6 m telescope. The data may be compared with previous data and with indirect determinations based on extinction measurements at 1 mm interpreted in terms of experimental water vapour transmittance measurements. It is shown that the cosecant law is justified in practice. Indirect measurements of water vapour at the European Southern Observatory, La Silla show that precipitable water vapour may be less than 2 mm for ∼ 50% of the southern hemisphere winter time. A low value of 0.6–0.7 mm is reported.
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