Entries tagged "frost lines"
It is that time of year when nature likes to get out her frost compasses for us to admire.
I took this photo last Friday in the middle of the day.
We are looking due west.
The southern sun has thawed the areas it can get to, but unlike other suns, it cannot refresh the parts it cannot reach. (My apologies, I think a retro marketing slogan tried to creep in there.)
The frost shadow on the sand itself is quite straightforward, but the shadows and frost on the logs are more interesting, particularly when…
It is that time of year again. The sun and Jack Frost are working together to paint the land.
In this photo of a dog-mauled football, we are looking southeast. But why does the football's shadow appear longer than the patch of frost? Surely, since the sun is rising it should be the other way round?
Useless clue: it doesn't have anything to do with the dog, who wisely avoids footballs until they are well defrosted.
UPDATE: The patterns of frost we see as the day wears on are shaped by more than one factor.
This photo of the roof of my home tells a story of the sun's journey.The morning shadow from the dormer window is retreating and the sun is reaching more of the roof with each minute. The frost from the night before is thawing in the warm light. It is also forming a very simple shadow compass. At this time of year the sun rises very close to east and the direction that the frost is retreating will be west to east. The protruding 'nose' of frost near the top of the roof can be joined to the jutting part of…
This picture was taken yesterday morning. The frost line on the top of my Land Rover runs close to a north-south line.The morning sun has risen in the southeast and warmed the eastern driver's side and southern rear of the car. The warming from the larger driver's side is having a greater effect, which is why the main frost line is north-south.