Your browser does not seem to support JavaScript. As a result, your viewing experience will be diminished, and you have been placed in read-only mode.
Please download a browser that supports JavaScript, or enable it if it's disabled (i.e. NoScript).
either of the two occasions in the year when the centre of the sun is directly above the Equator, and day and night are approximately equal in length:
Share your knowledge with the community
Browse our collection of 300,000+ community-written definitions
