By Gerald North BSc (auth.)
Every yr huge numbers of individuals take in the research of astronomy, regularly at beginner point. there are many ordinary books out there, choked with vibrant pictures, yet missing in right factors of the way and why issues are as they're. many of us ultimately desire to transcend the 'coffee-table ebook' level and learn this interesting topic in larger intensity. This booklet is written for them. furthermore, many folks sit down for public examinations during this topic every year and this publication is additionally meant to be of use to them. the entire issues from the GCSE syllabus are coated right here, with pattern questions on the finish of every bankruptcy. Astronomy Explained offers a finished remedy of the topic in additional intensity than is generally present in straightforward works, and may be of curiosity to either beginner astronomers and scholars of astronomy.
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The sails are then seen to ' sink' below the horizon as the ship further recedes. 2. 1 The Shape and Size of The Earth The next major advance came in 280 BC when Eratosthenes measured the circumference of the Earth. He was in charge of the vast library of scrolls at Alexandria. He knew from one of these scrolls that on noon at midsummer's day in Syene (now called Aswan) the Sun cast no shadows of vertical objects. In other words, the Sun was then directly overhead at Syene. O from the zenith as viewed from Alexandria.
In fact, the density increases towards the centre. This is because the Earth is chemically differentiated. By this it is meant that when the Earth was formed the lighter and more volatile substances rose to the surface while the heavier substances sank towards the Earth's centre. Seismographic studies have revealed that three distinct zones exist within the Earth. These are the core, the mantle and the crust. The core extends from the Earth's centre and out to a radius of 3500 kIn and consists of two parts: a fluid outer core and a central solid core.
Julius Caesar masterminded the modification of adding one extra day, to a 365 day year, to every fourth year. The additional day is added in February, which is the shortest month of the year. In order to determine whether a particular year is a leap year or not, simply divide by four. If there is no remainder it is a leap year and February has 29 days, rather than its usual 28. ) are only leap years if they are exactly divisible by 400. Thus 1900 was not a leap year but 2000 will be. Obviously, a small accumulative error will still be present in any artificial system such as this, but since this error will take more than 3000 years to amount to one day, it is ignored.
Astronomy Explained by Gerald North BSc (auth.)