Sun the house shield the internal spaces from

Sun is the main source of heat, light
and energy. Conventional houses are built in such a way that the components of
the house shield the internal spaces from sun. This makes the inhabitants to
opt for additional heating and lighting sources. The earthship should has a
shape and oriented such that it utilisation of available heat and light energy
from sun is maximum 7. The Orientation depends mainly depends on Azimuth
angle and Solar altitude. Azimuth angle is the angle of the sun from due North
in clockwork direction. Solar altitude refers to the angle of
the sun relative to the Earth’s horizon. It is measured in degrees 9. The
value of the solar altitude varies based on the time of day, the time of year
and the latitude on Earth. Regions close to the equator have a higher solar
altitude than regions near the Earth’s poles. The sun appears at different
angles at different places on the earth. The sun is at its highest point in the
sky on the day called Summer Solstice and lowest point on Winter Solstice.
Hence the earthship should be oriented such that it receives maximum light on
the day of Winter Solstice. In Northern Hemisphere the Summer Solstice and
Winter Solstice is between 21st  and 23rd June and between 20th
and 23rd December of every year respectively. At the Southern
Hemisphere it is the other way around. Azimuth angle and solar altitude shows
that in summer the sun is not just higher in the sky but also it moves in a
wider arc and in winter it moves in smaller arc. Based on the altitude of sun
in the noon on the coldest day of the year, the face of the glazing on the
earthship is tilted such that it is perpendicular to the sun at its lowest
point. This is done to decrease the reflection on the glazing and thus
increasing the amount of heat and light entering the ship. The same inclined
angle of the glazing helps to increase the reflection during summer
considerable and thus keeping it cool inside the ship 7.

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