Editing 1738: Moon Shapes
Warning: You are not logged in. Your IP address will be publicly visible if you make any edits. If you log in or create an account, your edits will be attributed to your username, along with other benefits.
The edit can be undone.
Please check the comparison below to verify that this is what you want to do, and then save the changes below to finish undoing the edit.
| Latest revision | Your text | ||
| Line 39: | Line 39: | ||
|2 ||[[File:moon2.jpg]]|| Gibbous moon || <font color="green">Normal</font> || Reality, as in this is how one of the moon's phases looks on a normal basis. | |2 ||[[File:moon2.jpg]]|| Gibbous moon || <font color="green">Normal</font> || Reality, as in this is how one of the moon's phases looks on a normal basis. | ||
|- | |- | ||
| − | |3 ||[[File:moon4a.jpg]]|| Crescent moon with horns away from horizon || <font color="green">Normal</font> || Reality, as in this is how one of the moon's phases looks on a normal basis. || | + | |3 ||[[File:moon4a.jpg]]|| Crescent moon with horns away from horizon || <font color="green">Normal</font> || Reality, as in this is how one of the moon's phases looks on a normal basis. || |
|- | |- | ||
|4 ||[[File:moon3.jpg]]|| Crescent moon with horns towards horizon || <font color="red">Not normal</font> || Not possible at night || This can only happen when the sun is above the horizon. Since a crescent moon means that the Sun and the Moon are relatively close in the sky, the Moon would not be visible with a naked eye, its light completely outshone by the sunlight. Randall comments that this is possible only during the daytime, marking it wrong as the background would not be black. According to this [https://en.wikipedia.org/wiki/Lunar_phase#/media/File:Moon_phases_en.jpg image] on Wikipedia's article on {{w|lunar phase}} "Phases of the Moon, as seen looking southward from the {{w|northern hemisphere}}. The {{w|southern hemisphere}} will see each phase rotated through 180°". This might seem to indicate that shape #3, which is visible in for instance USA where Randall lives should be seen like #4 in the southern part of South America, also at night! However, because the light portion of the moon is illuminated by sunlight (whether or not the moon is in the sky at the same time as the sun), the light side of the moon will always be facing towards the sun. If the moon is in the night sky, the sun must be somewhere "below" the horizon on the other side of the Earth. Thus, at night, the light portion of the moon must always be on the half of the moon that faces the horizon; However, in the case of twilight after sunset and shortly after (like the example painting), due to the [https://www.academia.edu/7848972/THE_MOON_TILT_ILLUSION moon tilt][https://www.seas.upenn.edu/~amyers/MoonPaper20June.pdf illusion] the bright side of the moon may appear to point up relative to an observer on the ground (although not to the extent show in the comic). But as the text from Randall points out there can be times during daytime when the orientation can go the other way. But then the background should not be black. Originally Randall wrote a different (wrong) sentence here and then corrected to the one currently explained, see [[#Trivia|trivia]] below.|| Van Gogh, {{w|File:Van Gogh - Passeio ao Crepúsculo.jpg|Landscape with Couple Walking and Crescent Moon}} | |4 ||[[File:moon3.jpg]]|| Crescent moon with horns towards horizon || <font color="red">Not normal</font> || Not possible at night || This can only happen when the sun is above the horizon. Since a crescent moon means that the Sun and the Moon are relatively close in the sky, the Moon would not be visible with a naked eye, its light completely outshone by the sunlight. Randall comments that this is possible only during the daytime, marking it wrong as the background would not be black. According to this [https://en.wikipedia.org/wiki/Lunar_phase#/media/File:Moon_phases_en.jpg image] on Wikipedia's article on {{w|lunar phase}} "Phases of the Moon, as seen looking southward from the {{w|northern hemisphere}}. The {{w|southern hemisphere}} will see each phase rotated through 180°". This might seem to indicate that shape #3, which is visible in for instance USA where Randall lives should be seen like #4 in the southern part of South America, also at night! However, because the light portion of the moon is illuminated by sunlight (whether or not the moon is in the sky at the same time as the sun), the light side of the moon will always be facing towards the sun. If the moon is in the night sky, the sun must be somewhere "below" the horizon on the other side of the Earth. Thus, at night, the light portion of the moon must always be on the half of the moon that faces the horizon; However, in the case of twilight after sunset and shortly after (like the example painting), due to the [https://www.academia.edu/7848972/THE_MOON_TILT_ILLUSION moon tilt][https://www.seas.upenn.edu/~amyers/MoonPaper20June.pdf illusion] the bright side of the moon may appear to point up relative to an observer on the ground (although not to the extent show in the comic). But as the text from Randall points out there can be times during daytime when the orientation can go the other way. But then the background should not be black. Originally Randall wrote a different (wrong) sentence here and then corrected to the one currently explained, see [[#Trivia|trivia]] below.|| Van Gogh, {{w|File:Van Gogh - Passeio ao Crepúsculo.jpg|Landscape with Couple Walking and Crescent Moon}} | ||
