Report on the Sun's RotationFill in the following table with your data for the two sunspots.
| Spot A | Spot B |
| Day No. | Time | Time | Angle | Day No. | Time | Time | Angle |
| (hr:min:sec) | (decimal) | (nearest deg) | (hr:min:sec) | (decimal) | (nearest deg) |
| 1 |
On the axes below plot each point (decimal time vs. angle) in a graph like the example in the figure in the lab write-up. Draw the
best straight line through your data. "Best straight line" means the line that passes closest to your points
without necessarily passing through any of them. There is no rule against the line passing through a data point, but you don't want to force the line to cross a data point just for the sake of it. The example graph in the write-up illustrates this idea: the line doesn't pass through any of the points but it passes close to all of them.
Use the two ends of the line (
not two data points) to calculate the slope of the graph (rise over run), which will have units of days per degree. Use this number to determine the period of the Sun's rotation, i.e., the time for the angle to increase by 360°. Record your results for each spot:
Spot ACoordinates of Point 1 on the line: Days = Angle = degrees
Coordinates of Point 2 on the line: Days = Angle = degrees
Slope = days/deg
Time of one revolution = days
Show calculation:
Spot BCoordinates of Point 1 on the line: Days = Angle = degrees
Coordinates of Point 2 on the line: Days = Angle = degrees
Slope = days/deg
Time of one revolution = days
Show calculation:
Average period of revolution = days
Note: Turn in all drawings along with this Results page.