Lumen de Lumine: Fr. Horacio de la Costa, SJ’s closing remarks at MO’s 100th anniversary in 1965

May 4, 2015

(From Centenary Program of Manila Observatory, 20 September 1965) I would like to call your attention to a curious fact. The first Jesuit Observatory to be founded anywhere in the world was founded in Asia. It was founded in, of all places, Peking,...

Sidereal Time: How to measure time by looking at the stars

April 8, 2015

A. What is Sidereal Time? In his book, Light Cavalry, Fr. Horacio de la Costa, SJ described Manila Observatory’s time-keeping service in the 1930’s–a service which dates even before the year 1900: The government supplies the Observatory with personnel, equipment, and special telegraphic...