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NightSeam Web
night-planning, computed in your browser
Weather · active site
Weather is loaded only when you click the chip above — nothing is fetched until then (except when auto-load is on).
Options
When on, the app fetches weather for the active site every time it opens, so the chip is already filled.
Appearance
Pick the look; it applies instantly and is remembered.
Layout
Takes that much space away on each side of the content. 0 lets it fill the window, higher values center a narrower column.
Catalog
Standard mode shows the curated 197-object list; advanced adds the full NGC/IC catalog (~12,000 objects to magnitude 20). Changing this reloads the app.
Timezone
Plan and display the night in this zone (only in advanced mode). Empty = the active site's zone, or this browser's zone. DST is applied per date.
Target scoring
Ranks targets down while the Moon is up; objects far from the Moon and clusters survive moonlight best.
1 = pristine dark sky, 9 = city centre. Darker skies lower the default minimum altitude and weaken moonlight penalties.
Equipment filters
Objects you own filters for are marked in the lists.
Object size units
About
NightSeam … — deep-sky night planning.
MIT licensed. Catalog: OpenNGC (CC BY-SA 4.0). Images: Wikimedia Commons. Weather: Open-Meteo.
Runs 100% client-side — your data stays in this browser.