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[World Design] Implications of a longer day
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<blockquote data-quote="Aexalon" data-source="post: 3577245" data-attributes="member: 16283"><p>Imagine if you would the moon of a jovian planet. Tidally locked with its big parent, the length of day would match the duration of one orbit of the moon around the planet (synodically). For the purpose of the discussion I'm soliciting, the following assumptions are made: <ul> <li data-xf-list-type="ul">That the moon be habitable and life-supporting (by whatever means), sporting an ecosphere not too dissimilar (in nature if not in appearance) to that of a terrestrial planet.</li> <li data-xf-list-type="ul">That the planet's apparent size be some 10-15 degrees across in the moon's sky, with your typical gas giant albedo (i.e., planetlight is going to be some <span style="color: Red">8 to 10</span> magnitudes -or <span style="color: Red">1600 to 10000</span> times- stronger than moonlight as we experience it on Earth. For reference, the Sun appears <span style="color: Red">~450000</span> times brighter in our sky than the moon does).</li> <li data-xf-list-type="ul">That the moon completes one orbit around the planet in 60 standard hours, and that the planet completes one orbit of its primary (or primaries) in 60 of these "lunar days" (entirely coincidentally, I assure you <img src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f642.png" class="smilie smilie--emoji" loading="lazy" width="64" height="64" alt=":)" title="Smile :)" data-smilie="1"data-shortname=":)" />)</li> </ul><p>The issues I see rising from this setup (besides the physical ones, which aren't the ones I'm looking to discuss at the moment) are the following: <ul> <li data-xf-list-type="ul">How would you see different fantasy races (and/or cultures) coping with a 30h day followed by 30h of night (which, depending on your location on the moon, may or may not be illuminated by the planet hanging motionless in the sky, undergoing a complete phase cycle every "day")? Would you advocate a simple scale-up (i.e. running around awake for 40h followed by 20h of sleeping)? Or would you (as I am) consider more interesting and complex sleep cycles, and if so, which?</li> <li data-xf-list-type="ul">How would you go about adjusting the D&D rules (3.5E for argument's sake) to handle a 60h day? Spell preparation? Natural healing? Effect duration? "x/day" abilities?</li> </ul><p>As to not restrict the discussion too much, feel free to consider much longer day lengths (though there climate effects are going to become much more pronounced as the "day" side heats up considerable, and the night side cools down likewise), or even shorter day lengths (like Earth in its early time). Now, have at thee!</p></blockquote><p></p>
[QUOTE="Aexalon, post: 3577245, member: 16283"] Imagine if you would the moon of a jovian planet. Tidally locked with its big parent, the length of day would match the duration of one orbit of the moon around the planet (synodically). For the purpose of the discussion I'm soliciting, the following assumptions are made:[list] [*]That the moon be habitable and life-supporting (by whatever means), sporting an ecosphere not too dissimilar (in nature if not in appearance) to that of a terrestrial planet. [*]That the planet's apparent size be some 10-15 degrees across in the moon's sky, with your typical gas giant albedo (i.e., planetlight is going to be some [COLOR=Red]8 to 10[/COLOR] magnitudes -or [COLOR=Red]1600 to 10000[/COLOR] times- stronger than moonlight as we experience it on Earth. For reference, the Sun appears [COLOR=Red]~450000[/COLOR] times brighter in our sky than the moon does). [*]That the moon completes one orbit around the planet in 60 standard hours, and that the planet completes one orbit of its primary (or primaries) in 60 of these "lunar days" (entirely coincidentally, I assure you :))[/list] The issues I see rising from this setup (besides the physical ones, which aren't the ones I'm looking to discuss at the moment) are the following:[list] [*]How would you see different fantasy races (and/or cultures) coping with a 30h day followed by 30h of night (which, depending on your location on the moon, may or may not be illuminated by the planet hanging motionless in the sky, undergoing a complete phase cycle every "day")? Would you advocate a simple scale-up (i.e. running around awake for 40h followed by 20h of sleeping)? Or would you (as I am) consider more interesting and complex sleep cycles, and if so, which? [*]How would you go about adjusting the D&D rules (3.5E for argument's sake) to handle a 60h day? Spell preparation? Natural healing? Effect duration? "x/day" abilities?[/list] As to not restrict the discussion too much, feel free to consider much longer day lengths (though there climate effects are going to become much more pronounced as the "day" side heats up considerable, and the night side cools down likewise), or even shorter day lengths (like Earth in its early time). Now, have at thee! [/QUOTE]
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