A Light exists in Spring — Spring Equinox

A Light exists in Spring 1
Not present on the Year
At any other period-
When March is scarcely here

A Color stands abroad 5
On Solitary Fields
That Science cannot overtake
But Human Nature feels.

It waits upon the Lawn, 9
It shows the furthest Tree
Upon the furthest Slope you know
It almost speaks to you.

Then as Horizons step 13
Or Noons report away
Without the Formula of sound
It passes and we stay-

A quality of loss 17
Affecting our Content
As Trade had suddenly encroached
Upon a Sacrament.
(F.962/J.812)
[1] light:: a concept, and the sunlight. Spring:: a hint on Spring Equinox, a specific moment of equal length of night and day.
[4] March:: it's in March 20 or 21.
[5] Color:: a property depending on whay people see.
[7, 8] Science, Human:: the difference in the fields cannot be measured by science, but human nature can feel.
[13] Horizons step:: a hint on the equinox, the sun crosses the Equator as if horizons step.
[14] Noons report:: noons as the equal point of night and day, tell the equinox passed.
[15] Without, sound:: to report the equinox without sound.
[19] Trade:: a trade should be fair, equal.
[19, 20] encroached, Sacrament:: the pass of equinox intruded the sacredness of equal trade.