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Progress Test 1 page 230

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Jase88 created the topic: Progress Test 1 page 230

Hi Bob and others,

Rpl/ppl study guide volume 2, progress test 1, page 230

During Summer in Australia, what direction from the departure aerodrome will the end of daylight (In LMT) be earlier?
Answer (A) North

Can someone please explain why this is the case? I can't find the explanation in the book and i just can't seem to visualise why it would be
north.

Thanks
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Stuart Tait replied the topic: Progress Test 1 page 230

The days get longer as you go south in Summer if you go far enough ie: Antarctica you will have 24 hours of daylight



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  • John.Heddles
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John.Heddles replied the topic: Progress Test 1 page 230

Adding a little extra to Stuart's post -

(a) quantifying the effect can be seen from the EOD chart in the AIP at

www.airservicesaustralia.com/aip/current...mplete_21MAY2020.pdf

page ref GEN 2.7-5.

(b) the effect, as shown in Stuart's graphics is due to the inclination of the earth's axis of rotation.

Some further information (and brain-strain mathematics from which you could, if you wished, arrive at the AIP graph) at

en.wikipedia.org/wiki/Sunrise_equation

The nice little multi-coloured graphic in that reference is useful for reflective contemplation ...

en.wikipedia.org/wiki/Sunrise_equation#/...nd_polar_circles.svg

Engineering specialist in aircraft performance and weight control.
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bobtait replied the topic: Progress Test 1 page 230

If the end of daylight occurs earlier, the days must be getting shorter. If you go south in summer, the days get longer and, as Stuart has said, if you go far enough south in summer, you will have 24 hours of daylight. It follows that if you go north in summer, the days will be getting shorter (EOD will occur earlier).

It would be a mistake if you flew from Brisbane to Cairns in the middle of summer and expected EOD to occur at the same time in Cairns as it does in Brisbane. You could be caught out after EOD with no place to land. That's the point of the question.
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