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Adam’s Peak (Sri Pada) sunrise shadow (Ira Sevaya): atmospheric optics and triangular projection?

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K
Klaus Atmospheric•915 rep

What optical ray divergence and cloud condensation conditions create the perfect triangular shadow of Sri Pada cast across western valleys at sunrise?

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5 Answers from travellers

✓Accepted Answer

The sunrise shadow phenomenon (Ira Sevaya) at Adam’s Peak (elevation 2,243m) is an atmospheric optical projection. As the sun rises over the eastern horizon behind the mountain, parallel solar rays strike the symmetrical pyramidal pinnacle. Because the mountain rises sharply above low-lying western valleys filled with cold morning mist, the peak blocks sunlight and projects its shadow onto the horizontal surface of the condensation cloud layer. Due to perspective foreshortening and linear vanishing points, the shadow appears as an isosceles triangle projecting into the western sky, regardless of the irregular contours of the summit rock.

41
R
Ranger Sisira Rescue•1810 rep

The shadow lasts for roughly 15 to 20 minutes after sunrise; as the sun climbs higher in the sky, the shadow compresses downward onto the mountain slopes before disappearing.

23
K
Klaus Atmospheric•915 rep

Simultaneously, pilgrims chant "Sadhu, Sadhu" as the sun appears to bounce or vibrate across the horizon (an illusion caused by thermal refraction through atmospheric layers).

18
D
Dr Senarath CCF•1920 rep

Position yourself on the western parapet railing of the summit shrine by 5:45 AM to secure clear viewing space before crowds turn around after sunrise.

15
S
Sarah Field Scout•1720 rep

If cloud banks are absent from western valleys, the shadow projects directly across the land surface all the way to the Indian Ocean coast off Kalutara.

12
D
Dr Bandara DWC•1890 rep

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