Somewhat to scale solar eclipse with point light except the sun is way too close.

bevy_solar_eclipse.rs

use bevy::prelude::*;

fn main() {
    App::new()
        .add_plugins(DefaultPlugins)
        .add_systems(Startup, setup)
        .run();
}

fn setup(
    mut commands: Commands,
    mut meshes: ResMut<Assets<Mesh>>,
    mut materials: ResMut<Assets<StandardMaterial>>,
) {
    let km = 1000.0;
    commands.spawn(PbrBundle {
        mesh: meshes.add(Mesh::from(shape::UVSphere {
            radius: 12_756.0 * km,
            stacks: 64,
            sectors: 64,
        })),
        transform: Transform::from_xyz(0.0, 0.0, 0.0),
        material: materials.add(Color::BLUE.into()),
        ..default()
    });

    commands.spawn(PbrBundle {
        mesh: meshes.add(Mesh::from(shape::UVSphere {
            radius: 1_737.0 * km,
            stacks: 64,
            sectors: 64,
        })),
        transform: Transform::from_xyz(-384_400.0 * km, 0.0, 0.0),
        material: materials.add(Color::GRAY.into()),
        ..default()
    });

    commands.spawn(PointLightBundle {
        point_light: PointLight {
            intensity: 100000000000000.0 * km.powf(2.0),
            shadows_enabled: true,
            range: 2_000_000.0 * km,
            ..default()
        },
        transform: Transform::from_xyz(-1_000_000.0 * km, 0.0, 0.0),
        ..default()
    });

    commands.spawn(Camera3dBundle {
        transform: Transform::from_xyz(-300_000.0 * km, 0.0, 450_000.0 * km)
            .looking_at(Vec3::new(-150_000.0 * km, 0.0, 0.0), Vec3::Y),
        ..default()
    });
}