@stwert: Thanks. when i started making it I was using the table from the below mentioned link to make this project. I started with a ratio where earths rotation 1 day= 1sec. =24 frames. Even with this ratio i was running into millions of frames for neptunes revolution around the sun. So gave up the idea and started making it with approx.values. T The wobbly movement of jupiter is bcoz the jupiter's inclination axis is 3 degrees. Was working perfect before but accidentally i must have freezed the transformations changing the local axes to world axes. I realised it after i rendered the complete thing. Thought i would get away with it and no one will notice it. You got me there. https://www.windows2universe.org/our_...ets_table.html https://www.sciencenetlinks.com/inter...lanetSize.html @Dave: I have used a point light inside the sun and played with the translucence values of the sun material. There is no other source of light other than the sun. cheers Mahesh