LONGITUDE fans have all been hit with a huge warning before the festival kicks off next Saturday. The hugely popular Dublin ...

Summer festivals: for latitude seek Longitude, for attitude draw Oxegen. As this summer’s festival line-ups are announced, it’s clear the promoters are tailoring to their audiences.

In decimal format these range from -90° to 90° latitude and -180° to 180° longitude. We needed to draw a polygon that goes across the antimeridian (the line at -180° / 180° longitude).

Draw four equally spaced lines of longitude on the balloon with permanent marker. Lines of longitude are imaginary lines running over the globe, connecting the North Pole with the South Pole.