Your reference to chariots reminded me of a note I had for Antiochus of Athens and so I have found a reference that is significant here:
Antiochus of Athens (presumed 2nd half of 2nd century BC). (From the PH 1993 text Antiochus of Athens,
The Thesaurus, p.31:
Planets are in their own chariots when they should be found in their own house (sign), exaltation, or boundaries (terms). And they rejoice at these places even if they are found under the beams of the Sun. For the benefics augment good things, and the malefics change to benefics.
No mention of being covered here ? I would be interested to see a reference to that to establish whether it does mean covered as in being protected from the Sun, as opposed to covered as in ?hidden? meaning rendered invisible by the Sun. Classical astrologers usually referred to planets as matutine or vespertine or
absconsae meaning 'hidden' (Firmicus says the Greeks used the term
afaneis for hidden)
The meaning of this seems pretty clear in denying the harmful effect I?ll admit. But this is saying that a planet isn?t harmed by combustion even if it is in its own terms, which is taking this to another level of ambiguity.
An argument I would make against this being taken up too readily is the fact that it also conflicts with the Hellenistic concept (I say Hellenistic, it?s actually much older and later than that, but it certainly applied in Hellenistic astrology) of planets being favourable when in their correct phase, and the advantages gained by being oriental or occidental, (or matutine, vespertine or absconsae), which is pretty major. Most of the classical authors tell us that a planet is most ?favourable? (Ezra calls them ?lucky? when in this position, other authors call them strong), when departing from a union with the Sun. Why? Because this perpetuates the much more ancient origin of the observational astrology that founded this. In your earlier post you said:
So far as I understand we do not know exactly what the Egyptians did in terms of practical horoscopy, or what their terminology was.
It?s not disputed that Egyptian astrology was heavily shaped by the notion that the stars and planets experienced the ending of a cycle as they underwent their heliacal setting, and that they were considered to be reborn at their helical rising where they emerged refreshed at the start of a new cycle. This was a very strong principle for the Egyptians (and the Mesopotamians too) and had a tremendous influence upon their culture and calendar.
I have written about this in more detail at
http://www.skyscript.co.uk/heritage/egyptians.html
Hellenistic astrology continues this philosophy in stating that planets which are separating from the Sun, and have passed the influence of the Sun Beams, are considered to be refreshed in energy and at the peak of their positive influence. When they are reuniting with the Sun they are weakened and dried. It?s hard to dismiss this latter concept, which is so consistent and readily apparent in Hellenistic astrology, without questioning the whole basis of all the Hellenistic understanding that extends from it. Yet if this principle holds, then a planet is going to undergo a transformative process in its union with the Sun no matter how dignified it is. Hence I can only return to my view that it may affect the interpretation of the nature of the combustion, but it is still going to experience a quality of combustion nonetheless.
Gosh, I don?t shift my opinions easily do I? But I hope you can understand why I feel that having a deeper understanding of the philosophy that has introduced the term in the first place is much more important than any simplistic rule or snapshot definition. Especially as these vary from author to author, as we can see from the quote I gave from Firmicus earlier.
I'll continue to add any references that touch upon this matter. I know I have seen some recently that discuss the limits of combustion with varying opinion, some suggesting that the orb of influence for Mars is greater than that of the other planets. And I definately saw a classical reference recently which defined cazimi (being 'at one' with the Sun) as operating within 1 degree instead of 16 minutes.