By Fred Hoyle

Investigate the universe with beautiful photos during this publication approximately astronomy.

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It is no wonder, therefore, that th<' first telescopes were all refractors. 17 shows a cross section through a con- vex lens with central axis OC. ) O is an is so that the section object emitting rays of light in OC see that the ray along without deviation, but the lens arc deviated. all all directions. J and B can be neglected. -1, and away from the normal at B in exactly the way we have discussed. Because of the symmetry of the lens, the ray emerging from B must continue to lie in the plane of OC and OA.

And because of the motion of the quadrant about the possible axis the observation of a star confined to its transit of the vertical would not need to be southern meridian. We could follow a star continuously; and by noting the moment ol maximum elevation we could, in fact, determine the southern meridian with precision than was possible far greater either with primitive immovable instruments or with wooden moving instrimients. Our instrument would have essentially the fea- Tycho Brahe's movable (juadrant.

Keep a close by the stick, noticing the moment when it is shortest. At that moment the Sun is at its zenith in other words it is just crossing your meridian. Assuming your island to lie in the northern hemisphere the Sim then lies to the south. some fixed object in the distant landscape to giv'e a permanent indication of the direction. That always to the south of your the compass, measure the angle Ijetween the ecliptic fixed object will and the equator, and fix your own geographical latitude? Could you possibly fix T, the point of intersection of the ecliptic and the equator?

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