Observation by Peter Anderson: Anti Solar Point

Uploaded by

Peter Anderson

Observer

Peter Anderson

Observed

2025 Dec 02 - 10:51

Uploaded

2025 Dec 02 - 10:51

Objects

The Earth

Equipment

Canon SX740HS camera

Exposure

1/250sec F5.6 100 ISO Zoom camera - 35mm equivalent of 152mm focal length

Location

Brisbane Australia

Target name

Anti Solar Point

Title

Anti Solar Point

About this image

Time quoted is local time for Brisbane Australia (UT plus 10 hours.)

My house and observatory are situated on a 176 metre high ridge and in the north-east there is an interesting gap in the hills in the direction of the Airport, Port, Moreton Bay and Moreton Island. The sun rises over the centre of this gap in mid winter. This means that near sunset in mid summer the sun shines through the clearing around our house and produces a nice effect of the anti-solar point in this direction. In the next few weeks this point (shown on the image) will move to the left until it is directly under this gap at the time of our summer solstice. - In other words, under where the Sun will rise 6 months later.

I find this an interesting demonstration of the anti-solar point directly opposite the sun where there is no shadow. I have usually only observed it from aircraft, tracking along with the aircraft, though it can be seen under some fog or other conditions if the angles are right.

The image has been adjusted for brightness and contrast only.

Files associated with this observation

Anti Solar point 2Dec2025 6,06pm equiv 152mm FL 1 250th F5,6 100 ISO.JPG (2.7 MB)

Like this image

Ian Jarrett, Dominic Ford

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