Purple moon in Cleveland TN (blue/blood moon)

[Zmouth]

that would make any moon of any phase 'blue' every single day of the year.
((just for the record, heavenly bodies all look redder near the horizon when they're viewed through thicker atmosphere, and bluer near the zenith for same reason))

.. but it's called a 'blue moon' when it's the 2[SUP]nd[/SUP] full moon of a single month.
source: my Oma

for why it's called that i'd have to go search info hwy myself.. and i didn't know anyone called it that for an 'additional' full moon during a season until this thread, wherein someone helpfully did some searching for me.

Let me guess, you believe the rainbow is the bow in the cloud that the LORD set as a sign that the waters on the earth would never destroy all life on earth, right? LOL, but using that as an example, do you see a rainbow every single time it rains? Thus it is relative to your position on earth and the angle at which the light is being refracted which produces the multicolored band.

 

[posthuman]

Let me guess, you believe the rainbow is the bow in the cloud that the LORD set as a sign that the waters on the earth would never destroy all life on earth, right? LOL, but using that as an example, do you see a rainbow every single time it rains? Thus it is relative to your position on earth and the angle at which the light is being refracted which produces the multicolored band.

moon moves across the sky every night & day. at some point every 24 hours - if it is only dependent on angle - no matter where on earth you are, you would be observing from the right relative location.

but it's not.

rainbows are different; it's refraction of light via water droplets ((or clouds, same thing really)) of just the right diameter at just the right angle. so you need an atmospheric phenomena ((to wit: a mist of just the right granularity)) to see one. justtas the S&T article cited, an atmospheric phenomena like the dust from a sandstorm or volcanic eruption hanging in the air, adding a blue-ish or green-ish hue to both the sun & the moon, and even starlight, though it's difficult to perceive. that's not a case of 'just the right angle' -- it's the stuff in the sky plus observing from a certain angle. face it, colloquial 'blue moon' is not referring to anything like this.

in case of sun dogs, to the left & right in clouds having the right sparsity when facing the sun. a traditional rainbow, facing away from the sun when there is a mist of right sparsity reflecting light back towards you. and of course in the spray around a waterfall when viewed from the right angle.

 

[Zmouth]

moon moves across the sky every night & day. at some point every 24 hours - if it is only dependent on angle - no matter where on earth you are, you would be observing from the right relative location.

but it's not.

Following that logic then the would be a solar eclipse once every 27 days since the moon travels in between the sun and the earth during each rotation around the earth.

Likewise, a solar eclipse isn't observable from any location on earth when the moon passes in between the earth and the sun but is only observable relative to the person location on the earth.

Did you know that the sun rises directly east and sets directly west only twice a year? The reason being because the relative position of the earth to the sun.

So no, the visible white light from the surface of the sun would not always pass thru the earth atmosphere at the angle necessary to produce the blueish hue upon the surface of the moon.

Likewise, one can not always see the great light from heaven that is above the brightness of the sun on earth since it only occurs when the right conditions are present.

rainbows are different; it's refraction of light via water droplets ((or clouds, same thing really)) of just the right diameter at just the right angle.

No, clouds are not tiny droplets of liquid water suspended in the atmosphere. If that was true then any time a plane passed through a cloud the plane would accumulate water droplets on its surface. However, water does not accumulate on the surface of the plane while passing through clouds, except when the conditions are present to produce condensation.

Likewise, the raindow appears because of the curvature of the atmosphere, light refraction produces the multicolored band but light refraction by it very definition means diverting the path of light from one straight line of travel along another straight line of travel, which is determined by the angle of refraction. Thus, light refraction does not cause the line of travel to arch, or bow.

 

[Ralph-]

We get it almost every night
When that moon is big and bright
It's a supernatural delight