T 3 3 
was rendered perceptible, thro’ the Exadnefs of niy 
Inflrument, even in the firft Year of my Obferva- 
tions; but being then at a Lofs to guefs, from what 
Caufe that greater Change of Declination proceeded, 
I endeavoured to allow for it in my Computations, 
by making ufe of the obferved annual Difference, 
as mentioned in p. 652. of the fame Tranfaffiion. 
From that time to the prefent, I have continued 
to make Obfervations at IVanfed , as Opportunity 
offered, with a View of difeovering the Laws and 
Caufe of this ‘Phenomenon : For, by the Favour of 
my very kind and worthy Friend Matthew Wy - 
mondefold Efq, my Inflrument has remained, where 
it was firft ereded 5 fo that I have been able, with- 
out any Interruption, which the Removal of it to 
another Place would have occafioned, to proceed 
on with my intended Series of Obfervations, for the 
Space of twenty Years: a Term fomewhat exceeding 
the whole Period of the Changes, that happen in this 
Phenomenon . 
When 1 fhall mention the fmall Quantity of the 
Deviation, which the Stars are fubjed to, from the 
Caufe that I have been fo long fearching after ; I am 
apprehenfive, that I may incur the Cenfure of fome 
Perfons, for having fpent fo much Time in the Pur- 
fuit of fuch a feeming Trifle: But the candid Lovers 
of Science will, I hope, make due Allowance for 
that natural Ardour, with which the Mind is urged 
on towards the Difcovery of Truths, in themfelves 
perhaps of fmall Moment, were it not that they tend 
to illuftrate others of greater Ufe. 
The apparent Motions of the heavenly Bodies arc 
fo complicated, and affeded by fuch a Variety of 
A 2 Caufes ; 
