Meteor Shower Calendar
CalculationTime
Meteor Shower Calendar
A printable annual observatory planner for major meteor families, visibility bands, peak-density windows, and notes beside the CalculationTime clockface.
Inputs, result, proof and time.
Use the instrument above, then check the calculation record, assumptions and related tools below.
Meteor windows
Plan an annual meteor-shower observing cycle
CalculationTime Meteor Shower Calendar
2026 Meteor Shower Plan
Thu, 01 Jan 2026 · Thu, 31 Dec 2026- Filter
- All months · North
- Included windows
- 7
- ZHR min
- 20 / hr
- Active window span
- 202 day(s)
Window coverage
7 showers meet the current criteria.
Active checks
Inputs are recalculated for every year change and month filter adjustment using local civil dates.
Calendar output
Print keeps the active list, month overview, assumptions and notes while hiding editing controls.
ShowerActive rangePeakZHRVisibility
Jan
5 active day(s)293031123456789101112131415161718192021222324252627282930311
Feb
0 active day(s)262728293031123456789101112131415161718192021222324252627281
Mar
0 active day(s)2324252627281234567891011121314151617181920212223242526272829303112345
Apr
15 active day(s)3031123456789101112131415161718192021222324252627282930123
May
32 active day(s)2728293012345678910111213141516171819202122232425262728293031
Jun
0 active day(s)12345678910111213141516171819202122232425262728293012345
Jul
22 active day(s)29301234567891011121314151617181920212223242526272829303112
Aug
29 active day(s)272829303112345678910111213141516171819202122232425262728293031123456
Sep
3 active day(s)311234567891011121314151617181920212223242526272829301234
Oct
31 active day(s)282930123456789101112131415161718192021222324252627282930311
Nov
39 active day(s)262728293031123456789101112131415161718192021222324252627282930123456
Dec
15 active day(s)3012345678910111213141516171819202122232425262728293031123
Notes
Use this planner beside your dark-site notes: lock the date window, target low Moon phases, and confirm local weather before planning travel.
Assumptions
Meteor windows are built from fixed annual peak windows and local civil-date stepping. Results are planning signals, not forecasts: local weather, sky brightness, latitude, and radiant drift can move practical viewing significantly.
Functional checks
1) Change year to validate all range boundaries and peak dates shift correctly. 2) Raise the minimum ZHR to prune low-intensity showers. 3) Filter by month and confirm month cards isolate overlap windows.
4) Use Print to verify the summary, calendar cards, and assumptions remain while controls hide.
Method
Window dates are built from fixed annual reference windows
For each calendar year the tool generates start, peak and end windows from internal meteor-shower constants, then marks month cells that overlap those windows. Peak intensity labels are based on published ZHR bands and are intentionally tagged as planning guidance only.
Print path
The print button opens browser print. Controls and interactive widgets hide while the report, list, month cards and assumptions remain.
Visibility split
Hemisphere controls switch descriptive visibility language only. Observability still varies with latitude, Moon phase, light pollution and weather.
Limits
This page is a planning aid. It does not predict real-time meteor counts and does not replace live observatory weather or sky-quality feeds.
Source Notes
Astronomical and implementation basis
Window baselines and annual peak bands are aligned to open-reference meteor-shower documentation and are represented as planning estimates. Browser JavaScript Date objects run all date stepping in local civil time at local noon to reduce edge-case DST ambiguity.