How to make a sun disk in blender

Question

3D

How to make the solar disk itself visible, for sunset, sunrise, as in the example?
https://yadi.sk/d/xgY9Ltlqcuoxh

Answer 1

plane with customized material not?

Answer 2

you can try to use a node to quickly create a sky in compositing
blender-3d.ru/forum/index.php/topic,479.msg5342.ht...
the method is universal and suitable for Blender Render and Cycles Render
vimeo.com/57911855