in folklore, a name for fire.

The maximum distance, usually horizontally, at which a given object or light source is just visible under particular conditions of transmittance and background luminance.

The difference between the true value of some quantity and its observed value. Every observation is subject to certain errors. Systematic errors affect the whole of a series of observations in nearly the same way. For example, the scale of an instrument m ...

Same as recording rain gauge.

Atmospheric layer throughout which there is no change of temperature with height, i.e. a zero lapse rate.

A line drawn through points of equal humidity on given surface.