While personally I have very little time for Penn’s Radian theory ( i believe the whole thing is taken out of context in more ways than one) ongoing semi-related research, gave me reason to carry out an experiment. The whole argument is that the angle between LHR and S.F forms an angle close to that of a radian and that’s why Stine was "positioned" in Presidio Heights.
Various arguments over the years have thrown up different excuses as to why an approximate estimate is still valid…depends what map, thickness of pen etc. It’s quite possible I have missed it,but I’ve never actually seen an estimate quoted by proponents of this theory…just that it was "close enough/ within a degree or so" to be valid.
I decided to do 3 different measurements using three different methods but using the same formula. It must be said that the "methods" threw up different data but the results are telling in my view. Don’t know that I haven’t made a mistake but by all means please double check and let me know if anyone discovers something different.
The formula is simple, measuring the distances between the different sites, the angles between them can be calculated.
1.The least accurate method is using the map and scale in Z’s Bus bomb map. the scale is 1 inch = 6.4 This throws up an angle of 63 degrees at Mt diablo.
2. Secondly I plotted the three sites on Google earth (there are slight variations depending on zoom). This threw up an angle of 64 degrees.(exact sites)
3. I plotted the precise co-ordinates of the sites (which should be most technically correct). The angle increased to 68 degrees.
None come remotely close to the 57.3 degrees to even make a valid agrument. In fact had Zodiac planned this radian theory he would have had to "position" his last victim somewhere to the west of San Rafael…15/20 miles to the north.
Minor correction…..Washington and Maple was used for measurements
Not to forget that you can calculate…if you know the cipher solution.
QT
*ZODIACHRONOLOGY*
Tahoe’s lovely pictures of an untouched map reveal that the inches measurement has to be about 5 inches, 5 1/2 inches, maximum. That’s nice to know.
The wiki page on Radian’s has been improved a lot, showing the start point at 3 o’clock (disagreeing with our friend Z, maybe).
http://en.wikipedia.org/wiki/Radian
There’s another nice page on the web here:
http://www.mathstat.strath.ac.uk/basicm … dians.html
…and several others.
They show us the notation in the Mt Diable "code" could have been something like:
"Two pi over seven point four two inches" or
"pi over six point four, two point two (inches)" and so on. Such fun.
The materials on the web (not those I don’t think) show you can ALSO express the radian angle using SEVERAL rotations of the circle, so something like:
"Fourteen pi over twelve (radians) four (i)" is possible.
At this point it becomes much less fun.
Plugging in all the uses of the notation, even using only two decimal places for the calculation, including the word "rad" or "radians", and allowing "I" on the end for "inches" is too much bussy work, even for a saddo like me.
I got: SIXTEEN PI OVER ELEVEN RADIANS THREE I the last time out – then of course realised that I’d have to do the maths for the angle to see if it made any sense – it might not – and that it seemed unlikely that Zodiac’s intended location would happen to be exactly on an arc of three inches from Mt Diablo.
So I’ve given up.
Again.
I Just thought I’d share the misery. 
Nice to see that you go such similar way to find out more…however I do believe that those texts don’t match the cipher 100%:
Although only few symbols repeat, it’s hard to find a match with same length etc….to compare below the solutions I had figured out, of which one led me to 26 St. Stephens Drive
QT
*ZODIACHRONOLOGY*
QT – no, not all the notations match the cipher (which is why I chose that one!) – but more than the one I used COULD be made to work.
I too used colours in Excel to help me with which symbols repeated. We’re tragic cases, you and I. 
You have "mil" in there for millimetres, not trusting the inches, eh? It’s a thought.
And the final problem. How do you know you’ve reached the right solution? You don’t. Unless you find a mirror and some wires, I suppose…..
QT – no, not all the notations match the cipher (which is why I chose that one!) – but more than the one I used COULD be made to work.
I too used colours in Excel to help me with which symbols repeated. We’re tragic cases, you and I.
You have "mil" in there for millimetres, not trusting the inches, eh? It’s a thought.And the final problem. How do you know you’ve reached the right solution? You don’t. Unless you find a mirror and some wires, I suppose…..
I don’t, but after hours I couldn’t find any other solutions..mil is used by snipers btw because bullet drops during flight time and is influenced by wind, too.
Z gave the hint with radians and inches, some locations end up in the nowhere (sea) so I chose the one i liked most..and was surprised to end up in Orinda, close to the Vallejo/Modesto scenes.
What still makes me curious is the drawing of this building, reminding me the Turn around in the snow card as well as the drawings in the Ramona High yearbook..got no better theory until now, but it is a theory.
Qt
*ZODIACHRONOLOGY*
