Tag Archives: Astronomy

Equinox

I’m posting this on March 20, the date of the first equinox of the year. In the northern hemisphere, we call it the spring or vernal equinox, because it marks the start of astronomical spring in northern latitudes. (The meteorological seasons follow the calendar months, so meteorological spring started on March 1.) Of course, for … Continue reading Equinox

The Celestial View From A Relativistic Starship: Part 4

This series of posts is about what the sky would look like to an observer travelling at close to the speed of light. In Part 1, I described the effects of light aberration on the apparent position of the stars; in Part 2, I introduced the effects of Doppler shift on the frequency of the … Continue reading The Celestial View From A Relativistic Starship: Part 4

The Celestial View From A Relativistic Starship: Part 3

This is the third of a series of posts about what the sky would look like for the passengers aboard an interstellar spacecraft moving at a significant fraction of the speed of light, like the Bussard interstellar ramjet above. In the first post, I wrote about light aberration, which will cause the apparent direction of … Continue reading The Celestial View From A Relativistic Starship: Part 3

Which Place Gets The Most Daylight?

So this puzzle isn’t about sunshine (the amount of time the sun shines from a clear sky), or even about the intensity of sunlight (which decreases with increasing latitude), but about cumulative daylight—the length of time between sunrise and sunset in a given place, added up over the course of a year.* It’s a surprisingly … Continue reading Which Place Gets The Most Daylight?