Paul Wilkes does not work for, consult, own shares in or receive funding from any company or organization that would benefit from this article, and has disclosed no relevant affiliations beyond their ...

I’ve been saying that today’s date is meaningless when it comes to doomsdays, which is true. But it does have astronomical significance, and for Northern Hemisphereans it’s a happy one: Today, at ...

Right ascension, a celestial coordinate dating back to Hipparchus, measures the east-west position of celestial objects along the celestial equator, starting from the vernal equinox. Right ascension, ...

THE U.S. Coast and Geodetic Survey makes magnetic observations at a set of repeat stations every five years, and publishes the results at similar intervals, in the form of tables of secular variation, ...