**Select Constellation:** Choose a constellation to dynamically draw it on the outer glass.
**Sliders:**
**Horizontal Rotation:** Spins the outer glass.
**Latitude:** Tilts both glasses vertically to match your location on Earth ($-90^{\circ}$ to $90^{\circ}$).
**Longitude:** Rotates both glasses to match your location ($ -180^{\circ}$ to $180^{\circ}$).
**Clocks:** The **Greenwich Mean Sidereal Time (GMST)** shows the celestial time at $0^{\circ}$ longitude, and the **Local Sidereal Time (LST)** shows the time at the longitude you select.
**3D View:** Click and drag the viewer to rotate the scene. Scroll to zoom in and out.