Ultimate West Sun Guide – is there still west sun for unblocked NS facing properties?

ultimate west sun guide unblocked NS facing
The Ultimate West Sun Guide

This is one criteria and most commonly asked question among the home buyers – “is the facing of this unit affected by the heat from the afternoon sun?” Here is a crash course on how to determine if your dream home really has no west sun.

Sunset Angle

Due to the Earth’s tilt (a.k.a. Obliquity or axial tilt) of 23.5 degree (see diagram below), the sun does not set at the same position all year round. This is the reason why we say that the sun is up for half a year and disappear for the next half at the north and south poles of Earth. Furthermore, this obliquity is a very important reason that makes Earth the Earth you always know. Without it, there will be no four seasons on Earth. Before I go in deeper into the technical details, we just have to remember this magic angle of 23.5 degree.

AxialTiltObliquity.png
Obliquity, source: Slate.com
Obliquity.gif
Source: Wikia

Sunset Position/ View

I have met many home buyers who are delighted to tell me that they have just bought a perfectly north south-facing home with unblocked view that has no west sun as well. That is not entirely true as his family only get to enjoy half a year without the heat of west sun.

Referring to the diagrams below, due to the axial tilt, the sunset position moves between 246.5 to 293.5 degree throughout the year where it reaches the both extreme ends in mid June and mid December. The truth is – the sun only sets exactly at 270 degree West on 2 days of a year.

west sun street view .jpg
Street View of Sunset in Singapore
sun position over time.jpg
Sun rise and sun set position in Singapore, source: Tau`olunga

Recommendation

If you want to avoid the west sun heat totally, you will have to identify building features that can possibly block and cast a shadow on your unit during sunset. You can identify this by first checking if your block has exterior features that can block out the west sun such as staircase stack or shades design. Subsequently, you can look at your block / estate layout relative to the other adjacent buildings referencing to the west position to identify possible buildings that will cast a shadow at your property.

Otherwise, even the so-called best facing property has to endure the heat from the afternoon sun half of the time.

Finally, when your are viewing for your dream home, do remember to check your compass for the entire west sun range from 246.5 to 293.5 degree, or 23.5 to the left and right of the exact west direction.

west sun top view
West sun for perfectly unblocked north south facing property in Singapore

 

 

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25 thoughts on “Ultimate West Sun Guide – is there still west sun for unblocked NS facing properties?

  1. This is a good guide for those looking to purchase a property in Singapore. I don’t have the money right now but I think I’ll look for a property that faces North.

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  2. Sounds really technical and not everyone can understand, especially if you are trying to spread news to the mass crowd.

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    1. From energy consumption point of view, a warm house will require more energy to cool down either via fan or air conditioning. I guess most people do not like to feel the heat when they just return home from office work. Think I’m in the younger generation too and that is what I thought of when I’m buying my current no west sun house 😀

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  3. wow at last… is that seems feng shui o.. hehee.. my house is between the sunrise,, and then back from the sunset, means like my home get a lil warm in the morning and cold in petang haha

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