The equinox will strike, like a bell, on Friday September 22. It heralds Continue reading “The Sun on the equator”
If Earth is a car, and we now look out of the rear window, Continue reading “Where Earth is heading From”
Whenever I have to carry a cardboard box, Continue reading “Boxing Day”
Here is a diagram I made for Continue reading “Leonids and the lingering Moon”
My cover picture for Astronomical Calendar 2015
A couple of geometric details about the Queen’s House
Here again is the sky chart
In a room in Pembroke College, Cambridge, hangs a round picture in a square frame.
To return to the subject of how orbits appear when plotted geocentrically (that is, with the Earth stationary).
The red curve is the shortest route between them.