Solar & Lunar Ephemerides Engine

Sky Watch & Celestial Mechanics

Zero-bloat, client-side astronomical calculators calibrated against the US Naval Observatory (USNO) Astronomical Almanac 2024 and Jean Meeus' Astronomical Algorithms.

Sunrise & Sunset

200+ Cities & Custom Lat/Lon

Moon Phase

Interactive SVG Visualizer

Golden Hour

Photo & Video Windows

Sunrise & Sunset in Braila, Romania

US Naval Observatory (USNO) Astronomical Almanac 2024 p.C24 & NOAA Solar Model

cos(H) = (cos(90.833°) - sin(δ)·sin(φ)) / (cos(δ)·cos(φ))

Select City

Date

Sunrise

02:57 AM

Official Horizon (90°50′)

Sunset

05:29 PM

Official Horizon (90°50′)

Solar Noon

10:13 AM

Highest solar culmination

Day Length

14h 32m

Golden Hour Photographic Windows (Sun < 6° Elevation)

Morning Golden Hour

02:57 AM – 03:57 AM

Warm dawn sidelight for landscapes

Evening Golden Hour

04:29 PM – 05:29 PM

Soft sunset illumination for portraits

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Lunar Phase & Illumination Visualizer

Jean Meeus, Astronomical Algorithms 2nd ed. Chapter 49 (Phases of the Moon)

Illumination = (1 - cos(2π · Phase)) / 2

Select Date:

77% Cycle

Last Quarter

44.1% Illuminated

Visible fraction of the lunar disc facing Earth

0% (New)50% (Quarter)100% (Full)

Moon Age22.7 daysin 29.53d synodic cycle

Phase Angle (k)276.8°geometric elongation

Astronomical Algorithm Note: Moon phases are governed by the synodic month (mean length: 29.53058867 days). Phase zero corresponds to the conjunction of the Moon and Sun (New Moon), while phase 0.50 denotes the exact opposition (Full Moon).

Golden Hour & Blue Hour Photography Calculator

Optimal solar lighting angles for landscape, portrait, and architectural photography

Golden Hour: 0° < Solar Elevation < +6° | Blue Hour: -6° < Solar Elevation < -4°

Location

Shoot Date

Morning Photography Windows

Morning Blue Hour~9000K Cool Light

02:32 AM – 02:57 AM

Deep indigo skies balanced with city streetlights. Ideal for urban architecture.

Morning Golden Hour~3500K Warm Light

02:57 AM – 03:57 AM

Low horizontal light, long soft shadows, mist illumination, and rich golden highlights.

Evening Photography Windows

Evening Golden Hour~3200K Warm Light

04:29 PM – 05:29 PM

Flattering warm skin tones for outdoor portraits and dramatic rim lighting on hair and leaves.

Evening Blue Hour~8500K Cool Light

05:29 PM – 05:54 PM

Vibrant saturated blue skies as street lamps ignite. Perfect for long exposure tripod captures.

Why Golden Hour Transforms Photography (Rayleigh Scattering)

When the sun is low on the horizon (solar elevation under 6°), sunlight passes through roughly 10 times more atmosphere than at solar noon. Rayleigh scattering selectively disperses short blue wavelengths (proportional to 1/λ⁴), allowing only longer golden, amber, and red wavelengths to reach the camera sensor. The resulting diffuse lighting minimizes harsh facial shadows and drastically expands dynamic range.

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Curated Laboratory & Study Equipment

Recommended Astronomy Optics & Field Guides

Hand-selected peer-reviewed literature, optical instruments, and mechanics resources verified by physics educator Traian Anghel.

Observation OpticsASIN: B000GUFOC8

Celestron NexStar 8SE Computerized Telescope

Top Pick for Planetary & Lunar Viewing

Celestron NexStar 8SE Computerized Telescope

8-inch Schmidt-Cassegrain optics with motorized StarPointer GoTo tracking for deep-sky observation.

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Field BinocularsASIN: B00B7LQ862

Nikon Aculon A211 10x50 Binoculars

Best Handheld Stargazing Optics

Nikon Aculon A211 10x50 Binoculars

Multicoated Aspherical Eco-Glass lenses ideal for stargazing, twilight scanning, and lunar craters.

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Reference BookASIN: 1108457568

Turn Left at Orion (5th Edition)

Standard Astronomy Field Guide

Turn Left at Orion (5th Edition)

By Guy Consolmagno & Dan M. Davis. The essential field manual for small telescope astronomers.

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