|HST Call for Proposals for Cycle 25|
Two documents are of primary relevance for HST proposers: this Call for Proposals and the HST Primer. The Call for Proposals discusses policies and procedures, and explains how to submit a Phase I proposal. The HST Primer provides a basic introduction to the technical aspects of HST and its instruments, and explains how to calculate the appropriate number of orbits for your Phase I observing time requests.The Call for Proposals is available electronically in HTML and PDF formats. The HTML version is optimized for on-line browsing, and contains many links to related or more detailed information, both within the document itself and in other STScI documents. You are therefore encouraged to use the HTML version electronically. Nonetheless, some people may prefer to read a hard copy, and with this in mind, the PDF version was optimized for printing.