Johannes Kepler

My latest post is about the work of the German astronomer Johannes Kepler (1571-1630).  He is most famous for his improvement to the earlier model of Copernicus by introducing the idea that the planets move in elliptical, rather than circular, orbits and that their movements in these orbits are governed by a set of laws,… Continue reading Johannes Kepler

Lunar eclipse 21 January 2019

On the night of 20/21 January 2019 there will be a total eclipse of the Moon, which will be viewable from many areas of the world. This will be worth making the effort to see, especially for my readers in the western USA and Canada for whom it will occur at a sociable hour. The… Continue reading Lunar eclipse 21 January 2019

Geocentric Cosmology

Today it is generally accepted as a scientific fact that the Earth is one of eight planets which revolve around the Sun, that the Sun is one of 400 billion or so stars in our Milky Way galaxy and that the Milky Way is one of hundreds of billions of galaxies in the observable Universe.… Continue reading Geocentric Cosmology

Solar eclipse 21 August 2017 – America on the move

Around 200 million Americans live within a day's drive of the total eclipse path, the narrow band of territory from Oregon to South Carolina.  According to an article in The Atlantic, up to 7 million people, perhaps even people reading this, will travel to see Monday's total eclipse. They will join the 12 million who are… Continue reading Solar eclipse 21 August 2017 – America on the move

Solar Eclipse 21 August 2017

As nearly all of my readers, particular those who live in the US, will know, there will be a solar eclipse on 21 August. For lucky viewers in a narrow band of territory running West to East across the US, it will be visible as a total eclipse - when the Moon completely obscures the Sun… Continue reading Solar Eclipse 21 August 2017

The equinox March 20 2017

Now that we are in the month of March, for most of us in the northern hemisphere the worst of the winter is over, and it is only a few days until 21 March, the first day of spring.   There is a commonly held view that March 21 is the spring equinox and that the equinoxes are the two… Continue reading The equinox March 20 2017

The Evening Star-Venus

Anybody who has looked up into the western sky after sunset in the past month will have noticed a brilliant white object - the planet Venus,  sometimes called the Evening Star. It is brighter than any other planet and ten times brighter than the brightest star Sirius, also known as the Dog Star. The "Evening Star"… Continue reading The Evening Star-Venus