A fact known from direct observation.
A premise from which conclusions are drawn.
A floating reference point, or SLDMB, used to evaluate surface currents in a body of water. Often employed by coastal search and rescue.
A fixed reference point or set of reference points which precisely define a system of measurement or a coordinate system.
To provide missing data points by using a mathematical model to extrapolate values that are outside the range of a measuring device.
That which is to be observed.
The practice of complying with a law, custom, command or rule.
Observation or the act of watching.
A rule governing a religious order, especially in the Roman Catholic church.
The custom of celebrating a holiday or similar occasion.
Reverence; homage.