Familia luciferum nondum viderat, cum caelum clarum factum est.

In Latin, familia is a singular noun. It refers to the household or family as one unit, so it takes a singular verb: viderat, not a plural form.

This is similar to English when we say the family was eating rather than the family were eating, depending on style.

Because luciferum is the direct object of viderat and so it is in the accusative singular.

A beginner might expect -um to mean neuter, but that is not always true. Here luciferum can be masculine accusative singular from lucifer. So the ending is showing its job in the sentence, not necessarily that it is neuter.

Nondum is an adverb meaning not yet. It modifies the verb viderat.

So luciferum nondum viderat means had not yet seen the light-bringer / morning star.

Latin adverbs often stand near the verb, but their position is fairly flexible.

Because viderat is the pluperfect tense of videre.

The pluperfect describes an action that had already happened before another past action. So:

• viderat = had seen
• not simply saw

That fits the timeline here: the family had not yet seen it before the sky became bright.

No. Here cum is a conjunction, not a preposition.

• As a preposition, cum means with and is followed by an ablative noun.
• Here it introduces a whole clause: cum caelum clarum factum est

So in this sentence cum means when.

Because this is a straightforward temporal clause: when the sky became bright.

Latin cum can be used in different ways:

• cum
  • indicative: often simple when
• cum
  • subjunctive: often when, since, or although with more background or circumstantial force

Here the clause is just marking the time of the event, so the indicative factum est is normal.

Literally, factum est is was made. But with an adjective like clarum, Latin often uses factus est / factum est in the sense of became.

So:

• caelum clarum factum est = the sky became bright

This is a very natural way for Latin to express a change of state.

Because it agrees with caelum, which is neuter singular.

So:

• caelum = neuter singular
• clarum = neuter singular to match it

This is normal adjective agreement in Latin: adjectives agree with the nouns they describe in gender, number, and case.

It is doing a little more than simply describing caelum.

Here clarum is a predicate adjective, linked to caelum through factum est. In other words, it tells us what the sky became.

So the structure is:

• caelum clarum factum est = the sky became bright

This is different from just caelum clarum, which would mean the bright sky.

Because the sentence is showing the order of events.

• viderat is pluperfect: had seen
• factum est is perfect: became

That means:

1. up to that point, the family had not yet seen the light-bringer
2. then the sky became bright

Latin is using tense very carefully here, just as English does with had seen and became.

Yes, the word order is normal, but Latin word order is much freer than English word order because the endings show each word’s role.

This sentence could be rearranged without changing the basic meaning, for example:

• Cum caelum clarum factum est, familia luciferum nondum viderat.

The original order may help emphasis or flow, but the grammar is still clear because of the case endings and verb forms.