What indicators in the horoscope can show whether a person is unusually light for his appearance or surprisingly heavy (without being fat at all)?
Hey Ayan,
In the original Rasi Sutras audio course Ernst describes how aspects from the planets to self-factors and different Ascendants result in different body types and heights. I think weight is something that generally fluctuates throughout people's lives. So I would use those techniques to determine general build.
I just wonder how people there can be who are relatively very heavy all their lives and at the same time have a harmonious physique, and on the contrary, some very large men do not weigh much at all.
I think it's down to build again. You can be large (for example Taurus rising with strong Jupiter aspect) and all your limbs are proportionate (Mercury aspects for example). But you can also be tall and lean, have disproportionately long limbs and not weigh much at all (Saturn aspects). Then, there's your general build as indicated in the Rasi, but transits or dasha periods could indicate weight gain due to health issues, indulgence, or whatever.