Oh wow. No, the sun doesn't represent all the sunlight that's available for plants.
First you have to measure outside of the earth's atmosphere, and then the inside. Then you'll see that much is dependent upon the atmosphere.
Secondly, if the tilt of the earth is different, we can have spots on earth that receives direct sunlight all the time. Even more than the poles do during their summer. Obviously what is available to a plant or can possibly be available to a plant depends upon where the plant is, the season and the atmosphere.
But oh well, my posts are invisible to Drich.
![[Image: tumblr_mkucs6YDpQ1qfacv7o1_500.gif]](https://images.weserv.nl/?url=31.media.tumblr.com%2Ff9de14a4619f6e85734c802d72e24b2f%2Ftumblr_mkucs6YDpQ1qfacv7o1_500.gif)
First you have to measure outside of the earth's atmosphere, and then the inside. Then you'll see that much is dependent upon the atmosphere.
Secondly, if the tilt of the earth is different, we can have spots on earth that receives direct sunlight all the time. Even more than the poles do during their summer. Obviously what is available to a plant or can possibly be available to a plant depends upon where the plant is, the season and the atmosphere.
But oh well, my posts are invisible to Drich.
