Build a calculation-fact natal report with HTML, PDF, DOCX, XLSX, ODS, EPUB, ODT, RTF, JSON, CSV, XML, NDJSON, TSV, Markdown, text, or ZIP delivery

Returns bounded standalone HTML and a structured fact list whose IDs link each displayed value to its chart response path. Optional embedded original SVG. Optional report_branding adds an escaped, text-only HTML co-brand with one fixed contrast-tested accent; it accepts no logo, URL, markup, template, or remote resource and is invalid with non-HTML formats. Strict include_download:true adds a deterministic base64 artifact; HTML remains the default, while download_format selects PDF, editable macro-free DOCX, editable formula-free macro-free XLSX, editable formula-free macro-free ODF 1.3 ODS, offline script-free EPUB 3, editable macro-free ODF 1.3 ODT, editable dependency-free RTF, deterministic UTF-8 JSON, deterministic RFC 4180-style UTF-8 CSV, deterministic fixed-order UTF-8 XML, deterministic one-record-per-fact UTF-8 NDJSON, deterministic escaped UTF-8 TSV, deterministic UTF-8 Markdown, deterministic UTF-8 plain text, or the predecessor ZIP with fixed HTML, PDF and calculation-JSON members. Every format has a fixed filename, byte count, media type and SHA-256. Omission/false preserves the predecessor response; no report is stored. Contains no generated interpretation, prediction, scripts, macros, formulas, customer templates or external resources. failed or timed-out admitted attempts are not refunded. Historical mode uses an explicit BCE/CE date object and UT1 conventions. Its response is the versioned historical envelope, not the modern UTC envelope. Read result for calculation fields and metadata for limits and uncertainty.