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https://github.com/Jermolene/TiddlyWiki5
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a9f9ffd409
* First commit * Typo * Add support for delay parameter * Add confetti widget * Add tour plugin * Add element spotlight to dynannotate plugin Useful for highlighting on screen elements for the user * More and bigger confetti by default * Use new element spotlight to provide hints * Adjust hint selectors for create tiddler tour step * Include confetti plugin in prerelease * Clarify wording of confetti demo * Don't link TiddlyWiki in the tour panel * Tweaks to tour buttons * Mark dependents of the tour plugin * Add full screen section of tour and tour edition * Remove Anna Freud references from welcome tiddler * Build the tour edition in the preview * Fix typo in build script * Populate tour edition with solar system data From Simple English Wikipedia * Missing tag * Add page control button to start tour Also make the tour controls visible in full screen mode * Refactor to use global procedures to control the tour * Change "startup-actions" field to "enter-actions" to avoid confusion * Add a tour logo * Refactor to allow multiple tours to be loaded at once * Remove wikification from welcome tour step * Update docs * Simplify styles for top bar * Tours should have a $:/tags/Tour tag * Tour should autostart in the tour edition, but not in the main wiki * Better labelling for the main preview * Fix build process We build a separate tour.html wiki, but can include the tour in other wikis too * Remove obsolete text * Add "using tags" as a separate tour * Remove old debugging code * Add tour chooser * Ensure that the current tour isn't listed as an option in the final step * Use whitespace trim Note that the setting is inherited by procedure and widget definitions * Simplify tour step format * Remove obsolete state tiddler Not needed because now we initialise it in startup actions * Fix gap between navigation buttons * Clean up tiddler titles within the introduction tour * Finish allowing the name "TiddlyWiki" to be customised Some of the code was in the previous commit. Next we'll wire up the user interface * Clarify docs * Add a settings pane giving a birds eye view of a tour * Avoid having to embed confetti in the final step * Update docs * Tweak styling of tour chooser dropdown * Add a button to launch tour steps directly, and give them captions * Expose custom tour settings * Use the tour step caption as the heading * Fix initialisation when jumping to a tour step * Introduce step about tags * Improve wording * Improve styling of task call-to-action and nav buttons * Adopt new conditional shortcut syntax * Wording and ordering tweaks * Fix typos Thanks @pmario * Simplify styling of tour overlay * Use custom palette colours Makes it easier for people to use their own colour scheme for the tour * More custom colours * Tour wording tweaks * Extends the tour plugin with a condition field (#7861) * feat: support condition field to determine whether a step should be shown * feat: add support for overriding the hint text using the field 'hint' from the step tiddler * fix: roll back tour display procedure for now until an override mechanism has been discussed * fix: renamed advance-criterion field and associated variables to step-success-filter * fix: renamed hint field to hint-text and selector to hint-selector * refactor: to create function to get all tour tiddlers filtered by their condition field * refactor: rename globals tiddlers to variables and avoid making any of the tour procedures global * fix: also rename globals.tid file to variables.tid * docs: cover all tour steps tiddler fields * fix: improve spacing in Tour HUD * WIP --------- Co-authored-by: Jeremy Ruston <174761+Jermolene@users.noreply.github.com> Co-authored-by: Saq Imtiaz <saq.imtiaz@gmail.com>
16 lines
1.4 KiB
Plaintext
16 lines
1.4 KiB
Plaintext
created: 20230720113501352
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modified: 20230720113633994
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title: Comet
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type: text/vnd.tiddlywiki
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tags: [[Solar System]]
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[img class=hero-image [Comet Image]]
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A comet is a ball of mostly ice that moves around in outer space. Comets are often described as "dirty snowballs". They are very different from [[asteroids|Asteroid]]. The orbital inclinations of comets are usually high and not near the ecliptic where most [[solar system|Solar System]] objects are found. Most of them are long-period comets and come from the [[Kuiper belt]]. That is very far away from the [[Sun]], but some of them also come near enough to [[Earth]] for us to see at night.
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They have long "tails", because the [[Sun]] melts the ice. A comet's tail does not trail behind it, but points directly away from the [[Sun]], because it is blown by the solar wind. The hard centre of the comet is the nucleus. It is one of the blackest things (lowest albedo) in the [[solar system|Solar System]]. When light shone on the nucleus of Halley's Comet, the comet reflected only 4% of the light back to us.
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Periodic comets visit again and again. Non-periodic or single-apparition comets visit only once.
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Comets sometimes break up, as Comet Biela did in the 19th century. Comet Shoemaker-Levy 9 broke up, and the pieces hit [[Jupiter]] in 1994. Some comets orbit (go around) together in groups. Astronomers think these comets are broken pieces that used to be one object.
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