<p type="main"><s>SALV. </s><s>I will u&longs;e my utmo&longs;t endeavours to render my &longs;elf
<lb/> <arrow.to.target n="marg813"></arrow.to.target>
<lb/> intelligible, but the difficulty of the accident it &longs;elf, and the
<lb/> great attention of mind requi&longs;ite for the comprehending of it,
<lb/> con&longs;trains me to be ob&longs;cure. </s><s>The unequalities of the additions
<lb/> and &longs;ub&longs;tractions, that the diurnal motion maketh to or from
<lb/> the annual dependeth upon the inclination of the Axis of the di­
<lb/> urnal motion upon the plane of the Grand Orb, or, if you plea&longs;e,
<lb/> of the Ecliptick; by means of which inclination the Equinoctial
<lb/> inter&longs;ecteth the &longs;aid Ecliptick, remaining inclined and oblique
<lb/> upon the &longs;ame according to the &longs;aid inclination of Axis. </s><s>And the
<lb/> quantity of the additions importeth as much as the whole diame­
<lb/> ter of the &longs;aid Equinoctial, the Earths centre being at the &longs;ame
<lb/> time in the Sol&longs;titial points; but being out of them it importeth
<lb/> le&longs;&longs;e and le&longs;&longs;e, according as the &longs;aid centre &longs;ucce&longs;&longs;ively approa­
<lb/> cheth to the points of the Equinoxes, where tho&longs;e additions are
<lb/> le&longs;&longs;er than in any other places. </s><s>This is the whole bu&longs;ine&longs;&longs;e, but
<lb/> wrapt up in the ob&longs;curity that you &longs;ee.</s></p>
<p type="margin"><s><margin.target id="marg813"></margin.target><emph type="italics"/>The cau&longs;es of
<lb/> the inequality of
<lb/> the additions and
<lb/> &longs;ub&longs;tractions of the
<lb/> diurnal conver&longs;ion
<lb/> from the annual
<lb/> motion.<emph.end type="italics"/></s></p>
<p type="main"><s>SAGR. </s><s>Rather in that which I do no not &longs;ee; for hitherto I
<lb/> comprehend nothing at all.</s></p>
<p type="main"><s>SALV. </s><s>I have already foretold it. </s><s>Neverthele&longs;&longs;e we will try
<lb/> whether by drawing a Diagram thereof, we can give &longs;ome
<lb/> &longs;mall light to the &longs;ame; though indeed it might better be &longs;et
<lb/> forth by &longs;olid bodies than by bare Schemes; yet we will help our
<lb/> &longs;elves with Per&longs;pective and fore-&longs;hortning. </s><s>Let us draw there­
<lb/> fore, as before, the circumference of the Grand Orb, [<emph type="italics"/>as in
<lb/> Fig.<emph.end type="italics"/> 4.] in which the point A is under&longs;tood to be one of the
<lb/> Sol&longs;titials, and the diameter A P the common Section of the
<lb/> Sol&longs;titial Colure, and of the plane of the Grand Orb or Eclip­
<lb/> tick; and in that &longs;ame point A let us &longs;uppo&longs;e the centre of the
<lb/> Terre&longs;trial Globe to be placed, the Axis of which C A B, in­
<lb/> clined upon the Plane of the Grand Orb, falleth on the plane of
<lb/> the &longs;aid Colure that pa&longs;&longs;eth thorow both the Axis of the Equino­
<lb/> ctial, and of the Ecliptick. </s><s>And for to prevent confu&longs;ion, let
<lb/> us only draw the Equinoctial circle, marking it with the&longs;e chara­
<lb/> cters D G E F, the common &longs;ection of which, with the plane of
<lb/> the grand Orb, let be the line D E, &longs;o that half of the &longs;aid E­
<lb/> quinoctial D F E will remain inclined below the plane of the
<lb/> Grand Orb, and the other half D G E elevated above. </s><s>Let
<lb/> now the Revolution of the &longs;aid Equinoctial be made, according
<lb/> to the order of the points D G E F, and the motion of the cen­
<lb/> tre from A towards E. </s><s>And becau&longs;e the centre of the Earth
<lb/> being in A, the Axis C B (which is erect upon the diameter of
<lb/> the Equinoctial D E) falleth, as hath been &longs;aid, in the Sol&longs;ti­
<lb/> tial Colure, the common Section of which and of the
<lb/> Grand Orb, is the diameter P A, the &longs;aid line P A &longs;hall
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