What is the difference between owning a house vs. occupying a house?
The owner of the house takes care of the house. It does so using the resources of the sign and house (etc) that it occupies. So if the lord of the 4th house is in the 6th for example, it suggests that there will be difficulties (6th house) for the 4th house because the owner is in a place that presents problems.
Should the owner have excellent dignity, or benefic aspects, or a significant yoga, then anything can become positive. So the 4th lord in the 6th in positive circumstances can suggst very strong emotions (and other 4th house things), which allow one to “defeat” enemies in a non-combative way, and overcome problems in a non-confrontational manner.
The occupant of a house utilizes the resources of the house to accomplish it’s aims (which include maintenance of the houses it owns, as mentioned above).
What are the Sanskrit names for the houses?
Some houses have more than one name, or sometimes are not named at all, just referenced by number. Here are some, off the top of my head…
1: Lagna (the anchor-house), Tanu (body)
2: dhana (wealth)
3: often unnamed, sometime bhrātṛ (peers / brothers)
4: bandhu (roots, ties, relationships, family)
5: putra (children)
6: often unnamed, sometimes śatrū (enemies)
7: jāyā (wife/spouse)
8: randhrā (chasm, void, abyss)
9: dharma (morality, virtue, religion)
10: vyoma (sky), karma (deeds)
11: labha (gain, profit), bhava (manifestation, fruition)
12: often unnamed, sometimes vyaya (loss, decay)
The word for “house” is sometimes bhava, or sometimes sthāna – which both basically mean “place.”
The 3rd house means emotional and physical strength. Does it mean if there is a problem with 3rd house both of them suffer?
In astrology there is a great deal of redundancy in the symbolism. That is, more than one thing symbolizes any given topic. This is extremely important. It is only by agreement among the several things symbolizing a topic that we can make a confident prediction about that topic. This is an extremely important principle of astrology, probably the single most important principle.
So if the 3rd house is weak, but the 1st house is strong – it is not likely that the person is markedly weak in a physical sense. If the the 3rd is strong but the 1st is very weak, the strength indicated is only emotional: bravery, and willpower, not physical.