Definitions Found:
an instrument for observing the sun without injury to the eyes
- helioscopean instrument for observing the sun without injury to the eyes
- helioscopesHELIOSCOPE, an instrument for observing the sun without injury to the eyes
- pyrheliometricrelating to measurement by pyrheliometer, an instrument for measuring the heating effect of the sun
- dipleidoscopean instrument for ascertaining the moment of meridian passage by observing the coincidence of two images
- dipleidoscopesDIPLEIDOSCOPE, an instrument for ascertaining the moment of meridian passage by observing the coincidence of two images
- coronagraphan instrument for viewing the corona of the sun
- pyrheliometeran instrument for measuring the heating effect of the sun
- coronagraphsCORONAGRAPH, an instrument for viewing the corona of the sun
- pyrheliometersPYRHELIOMETER, an instrument for measuring the heating effect of the sun
- heliostatan instrument using a mirror to reflect sunlight in a fixed direction, used for studying the sun or signalling messages
- heliostatsHELIOSTAT, an instrument using a mirror to reflect sunlight in a fixed direction, used for studying the sun or signalling messages