Equinox challenge reminder

You, diligent reader of these blogs, will remember the equinox challenge. The point is to practise your advocacy skills by explaining something complex in as simple a way as possible. Simple enough for a jury to understand.

Never mind, for the purposes of this challenge, that a judge would take judicial notice of the matter. Some judges might not.

The task is to explain why the sun rises at equinox due east for all observers (except those few people at or near the poles, who can be ignored for the purposes of this Level One exercise).

Pretend you are briefing an expert witness who will explain this to the jury. Get the witness to avoid technical jargon as much as possible.

Equinox is due soon: 20^th March 1144hrs GMT. I will post my answer – which will not necessarily be the best answer – a few hours before the moment of equinox (which will be at 0044hrs on the 21^st here in Auckland, as we will still be in summer time).