Slide the bottom left triangle up towards the right until it meets the triangle top right. Slide the top left and bottom right triangles together in the bottom left corner. Image caption ...

Draw the given side of the triangle using a ruler. Use a protractor to measure the angle from the left-hand endpoint of the given side, mark it with a cross and draw a line from the endpoint ...

This stellar trio is crossing the meridian at around 9 p.m. If you wait until around 2 a.m., the Triangle will have begun setting in the west-southwest. Usually, this is the most prominent ...