PMI


 * =**Plus**= || =Minus= || =Interesting= ||
 * The concept works! We got sunspots close to where we wanted them to be.

We were able to plot points that made sense in relation to where we would predict the sunspot to be. We were accurate enough for this stage.

We have a concept version - alpha || Compasses can be unreliable - especially when we don't know where the metal is. Sewers and electric cables can also affect the magnetic fields. We might need to advise users not to use compasses.

If we don't use compasses, then how can we find north? There might be an idea of fixing a position, but this takes away the universality of it. Finding north is non-trivial!

Precision will be an issue. The sundial can't work in the shade. We need direct sunlight. Cloud cover is no good.

Materials that are not waterproof are vulnerable to rain damage.

Were not sure if the ground is level. || How can we make sure the base is actually horizontal? A spirit-level on the base? A marble placed on the base?

The lid needs to be plastic and seal the whole thing over so it's weather-proof.

What if we invert the whole thing and have the cylinder coming down over the top?

We think it would be a good idea to test the next sundial on the roof. We also need a giant wooden platform to stop the metal interfearing with the compass.

Rigid, clear outer cylinder slides down over entire sundial.

Do cirumference and height have to have particular dimensions?

How do we align it with north? We can line it up against a building edge & use Google Earth to find the alignment of the building. But how can we develop a sighting mechanism to set up an appropriate sightline. ||