 So in this video, I want to introduce you to two different simulations that you're going to be using in lab today and That's for my physical sciences 153 lab students for the Sun Earth moon lab So the first one on part one of the lab is going to open up like this and It shows the Sun the moon and the earth not to scale it also gives you a little person here on the earth and Where that person is it's going to show what their view of the sky would look like up here To actually play the simulation Automatically moving forward in time you'd hit the yellow button the play button But you can also move forward or backward one hour or forward or backward one day By clicking these individual buttons You always know what time it is for the observer by the little clock up here Which will update as it's playing or if you click forward and backwards as Well as it's using the new moon as the start for counting the days and hours for the moon's position Now in addition to using the play buttons or the forward and backward button you can also grab and Rotate But you have to be careful about which direction is forward and back if you just manually grab it But if you're trying to reset things to a particular position You can use that for both the earth and the moon as you move them around So you guys are going to actually follow the instructions in the lab manual to do various activities Observe what you see here in the simulation and record your answers into lab report and this one is for part one Now from the same group we have a separate one, which is very similar here again, the Sun the moon and the earth and your time controls But now it also shows us the phase of the moon, which is visible to someone on earth Now it's not just for this person because some of the time the person might be sort of on the other side of the earth Where they can't see the moon at that particular time But for someone Somewhere on earth what phase of the moon would they see? So again as you move through time play You'll record your observations about what's happening here, and then you can use this to help you Answer the questions in the lab Now in the lab there's a similar diagram, but it has labeled numbered positions as long as you've got your moon in Approximately the same positions you should get accurate information about the phase of the moon If at any point in part one or part two you have any questions about how to use these two very closely related simulations, of course reach out to me to get a little bit more guidance so that you can finish your lab. I Hope you have fun exploring the Sun Earth moon system