1. desire:
[ME. a. OF. desire-r (earlier desidrer, desirrer) = Pr. desirar, It. desiare, disirare, Rom. type desirare:--L. desiderare to miss, long for, desire: see DESIDERATE v.]

desiderate:
trans. To desire with a sense of want or regret; to feel a desire or longing for; to feel the want of; to desire, want, miss.
[f. L. desiderat-, ppl. stem of desiderare to miss, long for, desire, f. de- (DE- I. 1, 2) + a radical also found in con-siderare, perhaps connected with sidus, sider- star, constellation; but the sense-history is unknown: cf. CONSIDER.]

consider:
[a. F. considérer (14th c. in Littré), ad. L. considerare to look at closely, examine, contemplate, f. con- + a radical (found also in de-siderare to miss, desire), according to Festus, derived from sidus, sider- star, constellation. The vb. might thus be originally a term of astrology or augury, but such a use is not known in the Lat. writers.]

de- (I. 1, 2):
I. As an etymological element. In the senses:

1. Down, down from, down to: as dependere to hang down, DEPEND (DEPENDENT, -ENCE, etc.); deponere to lay down, DEPONE, DEPOSE; deprimere to press down, DEPRESS; descendere to climb down, DESCEND; devorare to gulp down, DEVOUR. So of English formation, DEBREAK.

2. Off, away, aside: as declinare to turn aside, DECLINE; deducere to lead away, DEDUCE; defendere to ward off, DEFEND; deportare to carry off, DEPORT; designare to mark off, DESIGNATE; desistere to stand off, DESIST. b. Away from oneself: as delegare to make over, DELEGATE; deprecari to pray away, DEPRECATE.

(from OED)

To desire is, possibly, to come down from, off of, away from, or aside from the stars or constellation! - It's also related to 'to consider.'

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