Menu
News
All News
Dungeons & Dragons
Level Up: Advanced 5th Edition
Pathfinder
Starfinder
Warhammer
2d20 System
Year Zero Engine
Industry News
Reviews
Dragon Reflections
Columns
Weekly Digests
Weekly News Digest
Freebies, Sales & Bundles
RPG Print News
RPG Crowdfunding News
Game Content
ENterplanetary DimENsions
Mythological Figures
Opinion
Worlds of Design
Peregrine's Next
RPG Evolution
Other Columns
From the Freelancing Frontline
Monster ENcyclopedia
WotC/TSR Alumni Look Back
4 Hours w/RSD (Ryan Dancey)
The Road to 3E (Jonathan Tweet)
Greenwood's Realms (Ed Greenwood)
Drawmij's TSR (Jim Ward)
Community
Forums & Topics
Forum List
Latest Posts
Forum list
*Dungeons & Dragons
Level Up: Advanced 5th Edition
D&D Older Editions
*TTRPGs General
*Pathfinder & Starfinder
EN Publishing
*Geek Talk & Media
Search forums
Chat/Discord
Resources
Wiki
Pages
Latest activity
Media
New media
New comments
Search media
Downloads
Latest reviews
Search resources
EN Publishing
Store
EN5ider
Adventures in ZEITGEIST
Awfully Cheerful Engine
What's OLD is NEW
Judge Dredd & The Worlds Of 2000AD
War of the Burning Sky
Level Up: Advanced 5E
Events & Releases
Upcoming Events
Private Events
Featured Events
Socials!
Twitch
YouTube
Facebook (EN Publishing)
Facebook (EN World)
Twitter
Instagram
TikTok
Podcast
Features
Top 5 RPGs Compiled Charts 2004-Present
Adventure Game Industry Market Research Summary (RPGs) V1.0
Ryan Dancey: Acquiring TSR
Q&A With Gary Gygax
D&D Rules FAQs
TSR, WotC, & Paizo: A Comparative History
D&D Pronunciation Guide
Million Dollar TTRPG Kickstarters
Tabletop RPG Podcast Hall of Fame
Eric Noah's Unofficial D&D 3rd Edition News
D&D in the Mainstream
D&D & RPG History
About Morrus
Log in
Register
What's new
Search
Search
Search titles only
By:
Forums & Topics
Forum List
Latest Posts
Forum list
*Dungeons & Dragons
Level Up: Advanced 5th Edition
D&D Older Editions
*TTRPGs General
*Pathfinder & Starfinder
EN Publishing
*Geek Talk & Media
Search forums
Chat/Discord
Menu
Log in
Register
Install the app
Install
The
VOIDRUNNER'S CODEX
is LIVE! Explore new worlds, fight oppressive empires, fend off fearsome aliens, and wield deadly psionics with this comprehensive boxed set expansion for 5E and A5E!
Community
General Tabletop Discussion
*TTRPGs General
Smaller Planets
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Message
<blockquote data-quote="Nonlethal Force" data-source="post: 3391425" data-attributes="member: 35788"><p>Gravity is largely a function of mass. So, as a poster above said, make it even more metal rich than earth and it should be believable.</p><p></p><p>As far as length of day, that involves rotational velocity. In other words, how long does it take to spin around. The thing is, size does not matter. Think of a record or a CD. One revolution is one revolution regardless of the size. The thing that will get your mind in a twist is to realize that while the planet will be spinning with the same rotational velocity, the people on the surface of a bigger planet will be spinning around significantly faster than the people on the smaller planet in order to make the same number of revolutions (because the larger planet means they have farther to go, of course!). But, as far as in game effects that should be able to be ignored by all but the biggest of science geeks like me! <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p><p></p><p>Seasons are dependent upon the tilt of the planets spin ... also called the axis of rotation. That should be able to be the same.</p><p></p><p>One moon should be able to be the same. If your ground is the same mass (thus more dense to compensate for less matter) ... the moon could easily be exactly the same as earth's and in the same position so as to have the same tidal effects. If you want a closer moon (and thus bigger in the sky), it would either have to be made of less dense material or be smaller to have the same tidal effect. If you want a farther moon (and thus smaller in the sky) it would have to be more dense or larger to have the same tidal effects.</p><p></p><p>I think I got all that right. If not ... well, the advice was free! <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p></blockquote><p></p>
[QUOTE="Nonlethal Force, post: 3391425, member: 35788"] Gravity is largely a function of mass. So, as a poster above said, make it even more metal rich than earth and it should be believable. As far as length of day, that involves rotational velocity. In other words, how long does it take to spin around. The thing is, size does not matter. Think of a record or a CD. One revolution is one revolution regardless of the size. The thing that will get your mind in a twist is to realize that while the planet will be spinning with the same rotational velocity, the people on the surface of a bigger planet will be spinning around significantly faster than the people on the smaller planet in order to make the same number of revolutions (because the larger planet means they have farther to go, of course!). But, as far as in game effects that should be able to be ignored by all but the biggest of science geeks like me! :) Seasons are dependent upon the tilt of the planets spin ... also called the axis of rotation. That should be able to be the same. One moon should be able to be the same. If your ground is the same mass (thus more dense to compensate for less matter) ... the moon could easily be exactly the same as earth's and in the same position so as to have the same tidal effects. If you want a closer moon (and thus bigger in the sky), it would either have to be made of less dense material or be smaller to have the same tidal effect. If you want a farther moon (and thus smaller in the sky) it would have to be more dense or larger to have the same tidal effects. I think I got all that right. If not ... well, the advice was free! :) [/QUOTE]
Insert quotes…
Verification
Post reply
Community
General Tabletop Discussion
*TTRPGs General
Smaller Planets
Top