A projection device comprises first light sources, an interference disk, a condensing lampshade, and a driving device. Both of the interference disk and the condensing lampshade are arranged on light paths of the first light sources. The condensing lampshade is arranged behind the interference disk, and the interference disk is made stationary relative to the first light sources. The driving device drives the condensing lampshade to rotate. When the driving device drives the condensing lampshade to rotate, the projection light emitted after sequentially passing through the interference disk and the condensing lampshade projects an effect of clouds moving. The light paths of the projection light emitted by the first light sources are relatively stable after passing through the interference disk and before entering the condensing lampshade.

A projection device comprises first light sources, an interference disk, a condensing lampshade, and a driving device. Both of the interference disk and the condensing lampshade are arranged on light paths of the first light sources. The condensing lampshade is arranged behind the interference disk, and the interference disk is made stationary relative to the first light sources. The driving device drives the condensing lampshade to rotate. When the driving device drives the condensing lampshade to rotate, the projection light emitted after sequentially passing through the interference disk and the condensing lampshade projects an effect of clouds moving. The light paths of the projection light emitted by the first light sources are relatively stable after passing through the interference disk and before entering the condensing lampshade.

A projection device comprises first light sources, an interference disk, a condensing lampshade, and a driving device. Both of the interference disk and the condensing lampshade are arranged on light paths of the first light sources. The condensing lampshade is arranged behind the interference disk, and the interference disk is made stationary relative to the first light sources. The driving device drives the condensing lampshade to rotate. When the driving device drives the condensing lampshade to rotate, the projection light emitted after sequentially passing through the interference disk and the condensing lampshade projects an effect of clouds moving. The light paths of the projection light emitted by the first light sources are relatively stable after passing through the interference disk and before entering the condensing lampshade.

A projection device comprises first light sources, an interference disk, a condensing lampshade, and a driving device. Both of the interference disk and the condensing lampshade are arranged on light paths of the first light sources. The condensing lampshade is arranged behind the interference disk, and the interference disk is made stationary relative to the first light sources. The driving device drives the condensing lampshade to rotate. When the driving device drives the condensing lampshade to rotate, the projection light emitted after sequentially passing through the interference disk and the condensing lampshade projects an effect of clouds moving. The light paths of the projection light emitted by the first light sources are relatively stable after passing through the interference disk and before entering the condensing lampshade.

An atmosphere starry sky light for festival entertainment is provided. The constellation unit is configured to switch patterns of twelve constellations and perform projection display on the patterns of the twelve constellations. The starry sky unit is configured to project a starry sky background. The background unit is configured to project patterns of aurora, clouds, and ripples. The planetary unit is configured to switch patterns of a planet, and to project and display a planetary image. The constellation unit, the planetary unit, the starry sky unit and the background unit form a panoramic image of the cosmic starry sky by superimposing and combining.

An educational monument, comprising a designated geographical area accessible to a general public, a first structure having a first face positioned to receive a solar light beam, an aperture formed through the first structure for projecting the light beam at predetermined times and, a second structure positioned to receive the light beam at a first predetermined time. A third structure positioned to receive the light beam at a second predetermined time. Wherein a transition of the light beam reflects a change in the seasons and an alignment of Earth illustrating a physical representation of the transition at a plurality of successive predetermined times, each respective predetermined time being the same hour on a different day. Wherein a plurality of ellipses are scaled from the receiving wall, accurately representing the scaled orbit of the planets.

An atmosphere starry sky light for festival entertainment is provided. The constellation unit is configured to switch patterns of twelve constellations and perform projection display on the patterns of the twelve constellations. The starry sky unit is configured to project a starry sky background. The background unit is configured to project patterns of aurora, clouds, and ripples. The planetary unit is configured to switch patterns of a planet, and to project and display a planetary image. The constellation unit, the planetary unit, the starry sky unit and the background unit form a panoramic image of the cosmic starry sky by superimposing and combining.

An optical planetarium includes a projector configured to project images of stars; a diurnal-axis support mechanism configured to allow the projector to rotate about a diurnal axis; a latitude-axis support mechanism configured to allow the projector to rotate about a latitude axis that is orthogonal to the diurnal axis; an azimuth-axis support mechanism configured to allow the projector to rotate about an azimuth axis that is set vertically; and a latitude-axis inclination angle changing mechanism configured to allow an angle between the latitude axis and a horizontal plane to be changed within a predetermined range.

An optical planetarium includes a projector configured to project images of stars; a diurnal-axis support mechanism configured to allow the projector to rotate about a diurnal axis; a latitude-axis support mechanism configured to allow the projector to rotate about a latitude axis that is orthogonal to the diurnal axis; an azimuth-axis support mechanism configured to allow the projector to rotate about an azimuth axis that is set vertically; and a latitude-axis inclination angle changing mechanism configured to allow an angle between the latitude axis and a horizontal plane to be changed within a predetermined range.

An optical system for restoring a natural image combined with a digital image, in order to characterise and highlight the objects represented on the natural image. The optical system includes an objective lens, an eyepiece, a semi-reflective plate, a processing unit, capturing capabilities and restoring capabilities. Other embodiments relate to a method for producing such a digital image.