Friday, February 27, 2026
The Ross Precision Computer
Friday, February 20, 2026
The Day the Sky Turned Dark in New York City -- January 24, 1925
Calvin Coolidge, who had been the Vice President of the United States under Warren G. Harding, was now the President since Harding had suddenly died in office on August 2, 1923. At that time there was no way, unlike today after the passage of the 25th amendment to the Constitution in 1967, to nominate and confirm a Vice Presidential candidate to fill the vacancy created by Coolidge’s ascendancy to the Presidency.
Below is a local news article on the anticipated path of the area where the total eclipse would occur on that day.
You can see that New York City is on the southern fringe of the area covered by the total eclipse.
The following beautiful and rare art photo of the Total Eclipse of the Sun was taken by David Yerex from Highbridge Park on Washington Heights, overlooking the Harlem River and the Bronx, New York City, January 24th, 1925 at about 9 A.M.
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| Image copyright 2016, Friends of the High Bridge, LTD. |
David Yerex, would go on to take pictures of other future eclipses including the total solar eclipse of August 31, 1932 in New Hampshire, and the total solar eclipse of April 7, 1940 in Florida; and was honored by Life Magazine in 1940 with Life Magazine's Picture of the Week Award for the picture of the total eclipse of April 7, 1940, taken by him in Green Cove Springs, FL, just south of Jacksonville.
David Yerex led a colorful life. He lived in Providence, RI upon immigrating to the US in about 1893 and then met and married Annie McGregor Belmore after she immigrated from Nova Scotia to Boston in 1898. They moved to Boston where he was with the firm of E. Chickering. He was noted for his critically important photographs during this period of time. He divorced Annie and moved to New York City in the early 1910s, where he was employed by Underwood & Underwood. Underwood & Underwood was the world's largest producer of stereoview cards. It was during the 20s that the stereoview cards were losing market share and the firm was moving into photo images for the press, much like AP and UPI. He became naturalized as a citizen in 1917 and married a local girl named Helen of Irish descent. In 1920 he had moved to Washington Heights on 160th St. By the mid 1920s he had his own studio in the Bronx, not far from the High Bridge. Perhaps he walked the High Bridge from the Bronx with his equipment that cold wintry day to shoot the picture of the eclipse. During the 1930s he operated a photo studio providing portraits and other photographic services for the general public while he pursued his interest on the artistic side of the field. Around 1940 he moved back to Boston and lived there until his death. Very few of his known works still survive.
Saturday, February 7, 2026
Who was the First to recognize that Light has a Finite Speed and to Measure its Speed?
Galileo tried to measure the speed of light by having a servant take a lantern to a distant hilltop. Galileo was to open his lantern and as soon as the servant saw the light he was to open his lantern. When Galileo saw his servant's lantern he would have a measure of the round-trip-time. But of course, Galileo could only conclude that the light travel time was small compared to the servant's reaction time…i.e., it was very fast.
The first real measurement of the speed of light was made in 1675 by the Danish astronomer Ole Roemer. He kept track of the times that moons of Jupiter were eclipsed.
When he compared these data to calculations assuming uniform orbital motion he saw that the eclipse intervals got a little longer as the Earth moved further from Jupiter and a little shorter then as Earth approached Jupiter in the Earth's annual orbit around the Sun. He realized this was due to the increasing travel time for light. So knowing the size of the Earth's orbit he calculated the speed of light to be 200,000 Km/s.
Roemer's result wasn't very accurate. The first reasonably accurate value was calculated in 1728 by an English physicist, James Bradley.
Because of the Earth's speed in orbit a telescope has to be tilted slightly in the direction of motion toward a star. This is called stellar aberration. By comparing the angles for observations of a star six months apart and knowing the Earth's speed in orbit, Bradley calculated the speed of light to be 301,000 Km/s. Quite close to the current value.




