The sun rises over the hill opposite the main axis of Mnajdra. It is interesting to note that the sun does not rise exactly in the middle of the portal. It rises slightly to the right (looking out). Most probably the reason for this is that the alignment was meant to be seen projected into the building. Rising slightly to the right allows the sunlight to light up the edges of the inside portal and the innermost of the temple (see Equinox Ray of Light photograph).
Equinox Sunrise through portal

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