Solar system Solar system Uses of instrument With the help of this instrument we show the position and speed of earth and moon. 1) how does day and night takes place on the earth? 2) how does day and night takes place on poles within duration of 6 months? 3) how does moon revolves around the earth and why does it appears big and small? 4) how solar eclipse and lunar eclipse takes place? Working process of instrument To make the instrument in use the instrument is placed on the plane table with its handle pointing towards the right hand side as shown in figure. Good packing in wood box
