Can I place an order? Yes, Celestaire's activities are currently continuing. However, delivery times may be longer than usual and our selection of items available for shipping may be temporarily reduced. Please do not use delivery addresses for buildings that may be closed due to the current provisions (e.g. schools). We're working with our selling partners to keep products coming into our fulfillment center so we can more quickly receive, restock and ship these products to customers. Our teams are working to ensure availability of these products. We're continuing to ship all available selection in our inventory, but some products may currently take longer to ship. Dismiss
1. Imagine that the sun is directly overhead at a particular time. Then we simply look into the Nautical Almanac to find out where the sun is; and that is where we are!
2. How do we know the sun is directly overhead? The sextant tells us. It measures the angle from the horizon (meaning a level point) up to the sun. In this case the angle would be 90°.
3. But what if the sun were 1° away from overhead (sextant reads 89°)? Then we would be somewhere on a circle 60 miles (60 miles = 1°) from where the Nautical Almanac said the sun was. This is a circular line of position (LOP).
4. An actual position occurs where two lines of position (LOPs) cross. For example: where Interstate 80 and Interstate 35 cross; or where your latitude and longitude cross, or where the above circular LOP crosses another LOP.
5. If we look at the sun later in the day, we would get a second circle, and our position would be at one of the intersections (if you don’t know which one, do a third circle to settle the matter).