Spectral class M stars are red dwarfs; red and cool and small compared
to the Sun. This puts their habitable zones closer in. So close in
that the planet's rotation is affected by tidal forces from the star
that slow down its rotation (day) until it is the same as its orbital
period (year) thus meaning that one side of the planet is aways facing
the star and thus always hot and daytime, and the other side is always
facing away and cold and always nighttime making the only place good
for life on the boundary between nighttime and daytime where it is
always twilight. Also, these smaller, cooler stars have so much flare
activity that would easily strip away the planet's atmosphere.
Similarly, stars bigger and brighter than the Sun, like blue spectral
class A and F stars, are more short lived not giving intelligence as
much of a chance to evolve. Also they form more gas giant type planets
like Jupiter and Saturn. The Sun is in a perfect compromise between
these two kinds of stars. For these stars the eclipse ratio should be
about 400. The red dwarfs may have a longer life than our Sun but
their flare activity is a problem.
However, while I use the cited probability for stars with planets in
the habitable zone and the probability of those having Moons with the
400 to one eclipse ratio, I am thinking of computing with a
probability that corresponds not necessarily to an eclipse ratio of
400, but for a star simply where there is a perfect eclipse. That
condition is
While the rotation the planet loses energy to its moon, lengthening
its day, and thus the orbital radius of the moon growing, slowly over
millions of years, we suggest this perfect eclipse comes into being
when its kinetic energy to that of the planet it orbits maps a 24 hour
rotation period of the planet into one-second, as it does for our
Solar System. That is when
Would the day be 24 hours for such planets at this phase in its state?
It might be so, because it may mean such planets have Earth size, .
Is there something about the Sun that is common to other types of
stars; stars that are perhaps larger and hotter than the Sun, or
perhaps smaller and cooler, or a different color, like blue or red,
instead of yellow? The answer is yes. I actually found something in
ancient Vedic knowledge, in the Hindu traditions. Apparently, in Hindu
yoga the number 108 is an important number. I read that yogis today
noticed that the diameter of the Sun is about 108 times the diameter
of the Earth and that the average distance from the Sun to the Earth
is about 108 solar diameters, with 108 being a significant number in
yoga. So I wrote the equivalent: