This twenty-year-old boy was distinguished from childhood by strange qualities, a dreamer and an eccentric. A girl fell in love with him, and he went and sold her to a brothel...
Modern Western astrology is considered tropical astrology, though a small number of Westerner astrologers practice sidereal (and of those people a small number recognize Ophiuchus). The first sign (Aries) starts on the vernal equinox and then each sign is assigned it's 30 degrees of the heavens, making it into 12 parts, in other words twelve signs.
Whether or not they have the 4 seasons, the equinoxes and the solstices are recognized.
Ok, link to article posted on Agrias' facebook is here.
As for the 4 seasons? Regardless of wet or dry seasons as you are undoubtedbly meaning with that post, Kotora there are still 4 seasons to the year. There will always be a period known as Winter, Spring, Summer or Autumn (or by other names but it will mean the same thing) because it is not determined by weather otherwise we wouldn't have just 2 (wet and dry) there would be dozens to explain the different weather patterns we get. Weather patterns are determined by geography not the Earth's position in relevance to the Sun like seasons. The seasons are exactly 1/4 of a year each why? It's like I just said, they're determined by the orbit of the Earth round the Sun and the spin of Earth upon it's own axis. Hence why when it is summer in the northern hemisphere it is winter in the southern and vice versa.
You could in effect make a week 4 days long, and have a total of 91.3125 weeks in a year and make a month 6 weeks, yet there would still only be 4 seasons, sure each one would cover twice as many months (roughly speaking) but there wouldn't be more seasons just because we decreased the number of days in a week. In fact the human made 7 day week calendar is just that, human made. We could change the calendar so long as we follow the orbit of the Earth round the Sun for a year we'd be fine to change anything else. The seasons are in such a sense a constant in the galaxy because unless the Earth moved further out from the Sun or closer in, our seasons wouldn't change and if that did happen it is likely that the Earth would no longer support life and we could forget about it all in any case. Certainly the chances of this in our lifetime are pretty much non-existent.
So in effect, your comment about season's is just plain wrong, weather patterns are determined by topography, the lie of the land and atmospheric pressure more than anything else. Some places like England are always going to have a pretty predictable pattern involving copious amounts of rain for most of the year. Others like California are pretty much pre-destined to stay dry and sunny because of the same reasons.
All this boils down to meaning, even if we changed the calendar beyond what these ancient cultures who created the Zodiac recognize (which we have btw for reference) their Zodiac would still ring true, there is still only ever going to be 4 seasons each with a beginning, a middle and an end and well unless you're a physicist or an engineer pretty much in standard math 3.00 x 4.00 = 12.00 and that is how many Zodiac signs there are.
Cool story, bro.