observed longitude

observed longitude

[əb′zərvd ′län·jə‚tüd]
(navigation)
Longitude determined from observations which result in lines of position extending in a generally north-south direction.

observed longitude

The longitude determined from observations, which results in lines of position extending in a generally north-south direction.
References in periodicals archive ?
Moreover, eruptions so localized and energetic might not be from a merely ephemeral source: "If the source of these eruptions is fixed in position on the solid core of the planet, or is at a suitable depth for fluid friction to be a dominating factor, the observed longitudes of the initial outbreak should fit a constant rotation period.