Easins

The easins

View o the Yird's easins as seen frae Space Shuttle Endeavour, 2002.

The easins (frae Greek orizein, tae leemit) is the line that spleets the yird frae the lift. But at mony airts the true easins canna be seen as thare are trees, biggins, muntains an sae furth. The line is than cried the veesible easins.

Fermit airtins

• Derivation o the distance tae the easins