navigational planets[‚nav·ə′gā·shən·əl ′plan·əts]
The four planets commonly observed for obtaining data for use in celestial navigation: Venus, Mars, Jupiter, and Saturn.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The four planets commonly used on a celestial surface and in air navigation: Venus, Mars, Jupiter, and Saturn.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved