Before and now, there are still some differences in the orientation of the house, but this statement can only be used 120 years ago, because at that time, the houses were basically standard models, and the front of the house was the gate and patio, which was the strongest side of lighting, so there was nothing wrong with taking the door as the orientation. But now the house, the gate is not the only way of lighting, or even just an entrance, there is no light to collect, especially the buildings in the city.
In geomantic omen, the orientation of sitting is a very important subject, but it is more and more difficult to decide.
In principle, it is around the building. If there is a mountain, sit with it first. If there is water, orient it first.
If there is no real mountain and water, you can also look at rockeries (other buildings) and fake water (roads) first.
There are no mountains and no water around the building, with the emptiest side as the direction. Empty is Yang, and Yang is the direction.
The surroundings are the same, such as other buildings with the same height, such as some villages in the city and so on. Take the most daylighting side as the direction, most of the time it is a balcony or window.
Finally, when you can't tell the direction of sitting around, you just take the door as the direction.