1. A dual-path spatial heterodyne spectrometer for determining spectra of incident light comprising: a beam splitter configured to split incident light and to direct the incident light upon a first and a second diffraction grating, wherein the first diffraction grating has a first half configured for Littrow reflection of incident light at a first wavelength at a first order at a first angle, and a second half configured for Littrow reflection of incident light at the first wavelength at the first order at a second angle, wherein the second diffraction grating is configured for Littrow reflection of light of the first wavelength, and wherein light reflected by the first and the second diffraction grating forms interference patterns; an electronic camera for detecting the interference patterns, the camera comprising a detector having at least a first and a second group of pixel sensors; and a processing device coupled to receive information from the detector and to compute spectra therefrom.