These Pages are very much a work in progress and I would greatly appreciate comments on them from parents and teachers. You can find out about how and why I wrote them by following this link but as it is not intended for children I have not included it in the Contents.
Sam and his Mum and Dad and brother and sister live in an old lighthouse, twenty eight metres tall. It has lots of rooms but they are all on different floors and there is no lift so they are all very fit.
Sam is very interested in astronomy. He has his own astronomical telescope but he is most interested in “naked-eye astronomy,” what you can see in the Night Sky without a telescope. To Sam and many other people the Night Sky is the most wonderful sight in the world.
Sam is very sad that at School today you can learn about the Sun and Moon, the stars, the planets, galaxies and black holes and lots of other things without ever actually looking at the Night Sky.
When his friends come round he often explains the Night Sky to them by showing them what they can see from the old helicopter pad on top of the lighthouse (now with safety railings round it of course!) or playing games with them.
These Pages are about Sam’s ways of helping his friends to understand the wonderful things they can see in the Night Sky. You should read the Page on the size of the Solar System and the distance to the stars first because that is the key to everything that follows, but after that you can read the Pages one at a time and in any order, whatever you are curious about - use the Index to go straight to that Page.
On each Page there are lots of links to other Pages, but I suggest that if you are reading a Page for the first time you do not follow links to other Pages unless you really need to because you can easily lose the thread. Links marked FTPO are really intended for teachers and parents and older children.
You can get an app for your tablet or phone (Sam uses Planets for his iPad, but there are similar apps for Android) which will help you to find your way around the Night Sky as you look at it.
Sam probably knows more about the Night Sky than most other children of his age, and these Pages are written mostly for children of about his own age, or a few years older or younger, but I have added links to some of my own Pages for teachers and parents and older children if the maths or science or history gets a little too difficult for Sam to explain - after all he is only twelve! - such a Page is marked FTPO.
These Pages are really only about naked-eye astronomy. If you are a budding astronomer or astronaut who wants to know more about the things we have discovered in the sky since the telescope was first used (in about 1600 CE) here is a really Wonderful Site just for you. (On these Pages I use CE for Common Era rather than AD and BCE for Before Common Era rather than BC, for reasons explained here FTPO
Today most people believe that the Earth goes round the Sun, but until about four hundred years ago most people believed that the Sun went round the Earth - after all this is what everyone who is alive today or has ever lived can actually see happening! Sam asked me what happened four hundred years ago to make people change their minds and here is my explanation. You do not need to read it to understand about the Night Sky, but you do need to know about the Night Sky to understand the explanation - which is, whatever you have been told, nothing whatever to do with either Galileo or his telescope!
Sam and his Mum and Dad (and also real astronomers) sometimes get cross or upset when people get muddled up between astronomy and astrology, but they are not the same at all, for example both astronomers and astrologers can say “Mars is in Gemini” but when they say it they mean totally different things. If you are in any doubt about the difference here is a Page for parents and children to read together.