Returning to the magical number '432', Blavatsky writes: 

'[a previous commentator] justly believed that the cycle of the Indian system, of 432,000, is the true key to the Secret Cycle. But his failure in trying to decipher it was made apparent, for as it pertained to the mystery of the creation, this cycle was the most inviolable of all'. 

Joyce embeds some highly disguised information about such a Secret Cycle in the very mathematically oriented tenth chapter. He parodies Blavatsky's '432' and leads from there on to the world of modern physics: 

' . . . by ribbon development, from contact bridge to lease lapse, only two millium two humbered and eighty thausig nine humbered and sixty radiolumin lines to the wustworts of a Finntown's generous poet's office.' (265.24)

That is to say, from thunderclap to sandhi a cycle of 2,280,960 units. The mystery (the key to the Secret Cycle) lies in the nature of the quasi-scientific units; no one could be expected to derive the significance of the figure unaided, but fortunately the manuscripts provide the necessary clue. In British Museum Add. MS 47488, f. 246 we read: 

5,280 

      3 
---------
15,840 

      12 
---------
190,080 

        12 
-----------
2,280,960 

Now 3 X 12 X 12 = 432, and 5,280 = feet in a mile. The nature of the cycle is thus revealed: it is a space-time unit, a four-dimensional cycle of 432 mile-years, measuring a nonEuclidian world of four-dimensional events. The importance of this at first apparently peripheral piece of symbolism lies in the space-time concept. The Four, whose geometrical positions outline the frame which encloses the book,' are themselves the 'fourdimmansions' - the synoptic gospellers corresponding to the three space dimensions, and Johnny, always late, to time. With Einstein and Minkowski at his back Joyce was able to surpass even the ancient mystics in complexity and tortuousness. Like the mathematical world-model of Minkowski, the great cycle of Finnegans Wake cannot be properly understood unless the distance between 'events' is measured in terms of both space and time.

Hart, Clive / Structure and motif in Finnegans wake