LOCATION OF EVENTS 



45 



will cause different Doppler effects, FitzGerald con- 

 tractions, etc. There may be slight misunderstandings 

 until we realise that what you describe as a red square 

 is what I would describe as a green oblong, and so on. 

 But, allowing for this kind of difference of description, 



FUTURE 



id 



cc MY NQW 



Id Y oUR N°^ 



Id 



HERE-NOW 



v0 ornow. 



MY NOW 



**- s £V 



2f? 



W 



Id 



cr 



Ld 



I 



U 



<0 



_J 



Id 



PAST 



Fig. 3 



it will soon become clear that we are looking at the same 

 events, and we shall agree entirely as to how the Seen- 

 Now lines lie with respect to the events. Starting from 

 our common Seen-Now lines, you have next to make the 

 calculations for drawing your Now line among the 

 events, and you trace it as shown in Fig. 3. 



