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The same parabolic trough can be oriented in the east-west orientation. So, if this is east and this is west, then you can set it up such that it is in this orientation and then you don’t really have to track the sun through the day, you only need to change the orientation of the overall trough by just rotating it marginally. So, that you to do seasonal tracking concerning the position of the sun or the inclination of the sun based on the season and so,
it would point a little bit more towards the north during I mean or at least vertical upwards during summer, and point more towards the south during winter months. Since we spoke about concentrators through this class, let’s consider a large scale version of it. We spoke about a small dish which concentrates sunlight it is actually very nice because in you know all in two directions it is concentrating the sunlight on to one spot and therefore, you get a lot of concentration effect and of course, you have the challenge of tracking the sun. But suppose you want to make a large scale version of it, that just the small version which I could hold in your hand or you could hold in your hand etcetera but supposing you want to make a large scale version of it, where you want to generate several megawatts of electricity ok. So, then what would be a way to do it? If you can think of it’s like a huge parabola and in the middle, you have this unit which is gathering the current. So, you can think of a tower, a tower on top of it you have a point which is the focal point and this huge parabola which in two dimensional you know in both the axis it’s a parabola and then has this surface, a parabolic dish which is concentrating down to this point. So, just for