Radiant Compass — radius = 90° − elevation
Beam Now — –
Score & Radiant Elevation vs UTC
Radiant AZ
—
Radiant EL
—
Night weight
—
Peak weight
—
Score
—
Daily peak
—
Top Windows
| Start UTC | End UTC | Score |
|---|
Best Operations Schedule
| Start | End | Az° | El° | Intens |
|---|
Sked Intensity & Pointing vs UTC
Specular Geometry
Specular Lat
—
Specular Lon
—
A→S dist
—
B→S dist
—
A Bearing
—
B Bearing
—
Sked Schedule A↔B
| Start | End | Az A | El A | Az B | El B | Int |
|---|
Predictions use the A-QTH set in the Planner tab. Shows all showers with peak in the requested range.
| Shower | Peak UTC | RA° | Dec° | ZHR | Best Start | Best End | Az° | El° | Intensity | Notes |
|---|
☄ Meteor Scatter Planner & Sked — Web Edition
by Alex K6VHF · v2.0 Web (ported from Python v1.0.0)
by Alex K6VHF · v2.0 Web (ported from Python v1.0.0)
Plan and schedule VHF meteor-scatter (MS) operations. All physics runs in-browser — no install, no server.
Planner Tab
Set A-QTH (Maidenhead grid or Lat/Lon), choose a shower and date, then Compute Plan. The radiant compass shows where to point. The score timeline shows the best hours. Top Windows and Schedule give exact UTC windows with azimuth/elevation.
Set A-QTH (Maidenhead grid or Lat/Lon), choose a shower and date, then Compute Plan. The radiant compass shows where to point. The score timeline shows the best hours. Top Windows and Schedule give exact UTC windows with azimuth/elevation.
Sked Tab (A↔B)
Enter B-QTH and meteor specular height (default 95 km). The specular midpoint is computed on the great circle between A and B. Both stations' azimuth/elevation to the specular point is shown, plus a windowed schedule.
Enter B-QTH and meteor specular height (default 95 km). The specular midpoint is computed on the great circle between A and B. Both stations' azimuth/elevation to the specular point is shown, plus a windowed schedule.
Beam Now compass
Blue arrow = radiant direction for the current UTC. Red arrow = A→specular (shown after Sked is computed). Both give live AZ/EL readout.
Blue arrow = radiant direction for the current UTC. Red arrow = A→specular (shown after Sked is computed). Both give live AZ/EL readout.
NOW indicator
Top-right badge turns green when radiant el >10°, night weight >0.30, and peak weight >0.20. Score and weights update every minute automatically.
Top-right badge turns green when radiant el >10°, night weight >0.30, and peak weight >0.20. Score and weights update every minute automatically.
Predictions
Lists all showers with peak falling in the chosen date range. Uses A-QTH to compute the best 1-hour window, azimuth, and elevation for each shower. Exportable as CSV or plain-text table.
Lists all showers with peak falling in the chosen date range. Uses A-QTH to compute the best 1-hour window, azimuth, and elevation for each shower. Exportable as CSV or plain-text table.
Physics notes
Score = sin(el)^0.7 × night_weight × peak_weight. Night weight ramps linearly from 0.05 at sun el >0° to 1.0 at <−12° (astronomical twilight). Peak weight is a Gaussian around shower maximum with shower-specific σ in days. Specular aspect angle weighted by exp(−½((90°−Δaz)/25°)²).
Score = sin(el)^0.7 × night_weight × peak_weight. Night weight ramps linearly from 0.05 at sun el >0° to 1.0 at <−12° (astronomical twilight). Peak weight is a Gaussian around shower maximum with shower-specific σ in days. Specular aspect angle weighted by exp(−½((90°−Δaz)/25°)²).
Fixes & improvements vs Python v1.0.0
• Sporadic sporadic radiant uses correct 24h cycle with sin weighting rather than crude linear formula
• Grid-to-latlon adds 0.5° lat and 1.0° lon offset for cell centre (was missing)
•
• Sked intensity not gated to 0 when grayline is off (now properly normalized)
• NOW panel refreshes every 60 s automatically
• Full 2026 shower database with correct peak epochs
• Export buttons for all tables (CSV + TXT for predictions)
• Sporadic sporadic radiant uses correct 24h cycle with sin weighting rather than crude linear formula
• Grid-to-latlon adds 0.5° lat and 1.0° lon offset for cell centre (was missing)
•
best_windows_pointing correctly handles circular mean of azimuths• Sked intensity not gated to 0 when grayline is off (now properly normalized)
• NOW panel refreshes every 60 s automatically
• Full 2026 shower database with correct peak epochs
• Export buttons for all tables (CSV + TXT for predictions)
MIT License © 2025 Alex K6VHF. Web port: Claude Sonnet 4.