Spatial Press Journalhttps://www.spatial.press/blog/Guides, research, and provenance from Spatial Press.Personal Sky Charts: What Spatial Press Actually Makeshttps://www.spatial.press/blog/personal-sky-charts/https://www.spatial.press/blog/personal-sky-charts/Mon, 17 Aug 2026 12:00:00 -0700What a Spatial Press personal sky chart is, what inputs define it, and how the calculated sky becomes a print or digital object.ANGIE: The Sky-Chart Engine Behind Spatial Presshttps://www.spatial.press/blog/angie-sky-chart-engine/https://www.spatial.press/blog/angie-sky-chart-engine/Mon, 17 Aug 2026 12:00:00 -0700How ANGIE turns a date, time, and observer location into the geometry of a Spatial Press sky chart.Star Map vs. Sky Chart: What the Terms Actually Meanhttps://www.spatial.press/blog/star-map-vs-sky-chart/https://www.spatial.press/blog/star-map-vs-sky-chart/Mon, 17 Aug 2026 12:00:00 -0700The practical difference between a decorative star map, a star chart, and a personal sky chart tied to an exact observer.Why Exact Time and Place Matter in a Personal Sky Charthttps://www.spatial.press/blog/exact-time-and-place/https://www.spatial.press/blog/exact-time-and-place/Mon, 17 Aug 2026 12:00:00 -0700How clock time, latitude, longitude, and observer position change the local sky shown in a personal chart.Time Zones, Local Clock Time, and Historical Sky Chartshttps://www.spatial.press/blog/timezones-and-historical-times/https://www.spatial.press/blog/timezones-and-historical-times/Mon, 17 Aug 2026 12:00:00 -0700Why a recorded local time is not yet an astronomical instant, and why historical timezone rules can be part of chart reconstruction.Is Spatial Press Astronomy or Astrology?https://www.spatial.press/blog/astronomy-and-astrology/https://www.spatial.press/blog/astronomy-and-astrology/Mon, 17 Aug 2026 12:00:00 -0700Where Spatial Press uses astronomical reconstruction and where symbolic or astrological interpretation is a separate layer.From Personal Sky Chart to Custom Celestial Printhttps://www.spatial.press/blog/custom-celestial-prints/https://www.spatial.press/blog/custom-celestial-prints/Mon, 17 Aug 2026 12:00:00 -0700How one calculated Spatial Press render moves into posters, digital files, and other product formats without changing the underlying moment.How to Research the Most Accurate Birth Data for a Sky Charthttps://www.spatial.press/blog/find-your-accurate-birth-location/https://www.spatial.press/blog/find-your-accurate-birth-location/Mon, 17 Aug 2026 12:00:00 -0700A practical workflow for moving from a birth certificate to a historically defensible birthplace coordinate — even down to a maternity wing when the evidence survives.Birth Certificates, Recorded Time, and What the Document Actually Proveshttps://www.spatial.press/blog/birth-certificates-and-recorded-time/https://www.spatial.press/blog/birth-certificates-and-recorded-time/Mon, 17 Aug 2026 12:00:00 -0700How to separate the facts written on a birth record from later assumptions about exact time, facility, and location.How to Research a Historic Hospital Location — Down to the Maternity Winghttps://www.spatial.press/blog/researching-historic-hospital-locations/https://www.spatial.press/blog/researching-historic-hospital-locations/Mon, 17 Aug 2026 12:00:00 -0700A source hierarchy for reconstructing where a hospital actually stood, which building handled births, and how to avoid false precision.Coordinates vs. Place Names: Why a Sky Chart Needs Bothhttps://www.spatial.press/blog/coordinates-vs-place-names/https://www.spatial.press/blog/coordinates-vs-place-names/Mon, 17 Aug 2026 12:00:00 -0700Why latitude and longitude define the viewpoint while a place name preserves human context, timezone resolution, and provenance.How Many Decimal Places Do Birth Coordinates Need?https://www.spatial.press/blog/decimal-coordinate-precision/https://www.spatial.press/blog/decimal-coordinate-precision/Mon, 17 Aug 2026 12:00:00 -0700What coordinate decimals mean in physical distance, and why extra digits should never imply evidence you do not have.Daylight Saving Time Can Change a Historical Birth-Sky Reconstructionhttps://www.spatial.press/blog/daylight-saving-and-birth-times/https://www.spatial.press/blog/daylight-saving-and-birth-times/Mon, 17 Aug 2026 12:00:00 -0700Why daylight-saving rules must be resolved for the exact place and date rather than assumed from today’s convention.Civil Time Is Historical Datahttps://www.spatial.press/blog/civil-time-is-historical-data/https://www.spatial.press/blog/civil-time-is-historical-data/Mon, 17 Aug 2026 12:00:00 -0700Why clocks, time zones, daylight-saving rules, and local conventions belong in the source record when reconstructing historical skies.Altitude and Azimuth: The Coordinates of the Sky You Actually Seehttps://www.spatial.press/blog/altitude-azimuth-explained/https://www.spatial.press/blog/altitude-azimuth-explained/Mon, 17 Aug 2026 12:00:00 -0700A concise explanation of altitude, azimuth, the horizon, and why these coordinates depend on the observer.Why Planets Move Differently From the Background Starshttps://www.spatial.press/blog/why-planets-change-faster-than-stars/https://www.spatial.press/blog/why-planets-change-faster-than-stars/Mon, 17 Aug 2026 12:00:00 -0700Why solar-system bodies require time-dependent ephemerides while distant stars can often be treated differently over short human timescales.How to Reconstruct a Historical Sky From Archival Recordshttps://www.spatial.press/blog/reconstructing-skies-from-archives/https://www.spatial.press/blog/reconstructing-skies-from-archives/Mon, 17 Aug 2026 12:00:00 -0700A practical research method for turning diaries, certificates, newspapers, photographs, maps, and institutional records into chartable time and place evidence.What Provenance Means for Computational Arthttps://www.spatial.press/blog/provenance-for-computational-art/https://www.spatial.press/blog/provenance-for-computational-art/Mon, 17 Aug 2026 12:00:00 -0700Why a computational image should preserve sources, inputs, transformations, and versioned rendering decisions instead of only the final pixels.A Source Hierarchy for Historical Location Researchhttps://www.spatial.press/blog/source-hierarchy-for-historical-location/https://www.spatial.press/blog/source-hierarchy-for-historical-location/Mon, 17 Aug 2026 12:00:00 -0700How to rank records when you are trying to identify a historical address, building footprint, campus, room, or other precise location.From Portales to a Point: A Birthplace Provenance Case Studyhttps://www.spatial.press/blog/from-portales-to-a-point/https://www.spatial.press/blog/from-portales-to-a-point/Mon, 17 Aug 2026 12:00:00 -0700How the Spatial Press sample chart moves from a city-level birth record toward a historically defensible hospital coordinate — while keeping the maternity ward unresolved.JPL Horizons, Ephemerides, and the Observer in the Skyhttps://www.spatial.press/blog/jpl-horizons-and-observer-geometry/https://www.spatial.press/blog/jpl-horizons-and-observer-geometry/Mon, 17 Aug 2026 12:00:00 -0700What an ephemeris is, why observer location matters, and what NASA/JPL Horizons reveals about the geometry behind personal sky charts.What a Star Catalog Actually Containshttps://www.spatial.press/blog/what-a-star-catalog-is/https://www.spatial.press/blog/what-a-star-catalog-is/Mon, 17 Aug 2026 12:00:00 -0700A plain-language guide to stellar catalogs, astrometry, proper motion, parallax, brightness, uncertainty, and why catalog versioning matters.Celestial Imagery, Public Data, and Commercial Licensinghttps://www.spatial.press/blog/celestial-imagery-and-licensing/https://www.spatial.press/blog/celestial-imagery-and-licensing/Mon, 17 Aug 2026 12:00:00 -0700Why a scientifically interesting planet image is not automatically cleared for a commercial product, and how Spatial Press thinks about source rights.How to Check Whether a Personal Sky Chart Is Actually Personalizedhttps://www.spatial.press/blog/how-to-check-a-personal-sky-chart/https://www.spatial.press/blog/how-to-check-a-personal-sky-chart/Mon, 17 Aug 2026 12:00:00 -0700A practical buyer’s test for whether a custom star map or sky chart really changes with date, time, and location.How to Read a Spatial Press Sky Charthttps://www.spatial.press/blog/how-to-read-a-spatial-press-chart/https://www.spatial.press/blog/how-to-read-a-spatial-press-chart/Mon, 17 Aug 2026 12:00:00 -0700A concise guide to the main spatial layers in a Spatial Press chart: observer, horizon, orientation, celestial bodies, labels, and provenance.