A LEADING feature of present-day methods of navigation is the use of tables. There is scarcely any method in use in navigation for which one, and probably many, tables, of more or less practical ...

Runway numbers are based on the magnetic azimuth of the runway centerline, measured clockwise from magnetic north. The Earth's magnetic field shifts over time (declination), causing changes in ...

Comprehending the mechanics of a compass is a helpful skill. Whether you are a hunter, outdoor enthusiast, survivalist, or simply an individual seeking a better understanding of orienteering skills, ...

Tracking satellites and the ISS is pretty easy. All you really need is an SDR dongle or a handheld transceiver, a simple homebrew antenna, and a clear view of the sky. Point the antenna at the passing ...

Virtual explorer Robert Criss, Ph.D., professor of earth and planetary sciences at Washington University in St. Louis, has teamed up with Lewis and Clark to provide the oldest determinations of the ...

THE remarkable paper on Stonehenge, by Sir N. Lockyer and Mr. Penrose, in NATURE of November 21 has greatly interested me. Just two years ago, I was working at the subject, and wrote to Prof. Petrie ...