# Calendarium - About this Day — This day Now and in History

> Daily historical events, astronomical data, and calendar information. (iPhone/iPad app by Piotr Knapczyk.)

- Source: https://appshunter.io/ios/app/calendarium-about-this-day/id482136387 (this page in markdown: same URL + `.md`)
- Developer: [Piotr Knapczyk](https://appshunter.io/developer/1541886746)
- Category: Reference, Education
- Price: Free
- Rating: 4.70/5 from 2,247 App Store ratings · 252 written reviews indexed
- Age rating: 4+
- Requires: iOS 9.0 · 54 MB
- Languages: European Spanish, American English, Japanese, Polish
- Released: 2011-11-29
- Data updated: 2026-08-28
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/calendarium-about-this-day/id482136387/reviews.md

## What is Calendarium?

Calendarium is new, easy to use calendar which gives you a new way to discover many interesting things about this day.

Calendarium combines calendar of historical events with times of sunrise/sunset, number of week, day, day length, moon phase and more.   

–– What our users think ––

" Fascinating!" –  Snaarl

"It is a great way to see the history of the day. I always learn something new."  -   Nancy Rohe

"Use this app every day! Fun to learn new info from a wide time range of history." - M1d2i3v4

"This is a trivia nerd's Nirvana, and a history buff's Beulah! Bravo! to the developers of this app!" –  jmhillpresley
––––––
• #1 App in 3 Countries
• #1 Reference App in 40 Countries
• Over half million downloads
––––––

Features: 
  • On this day in history - Discover historical events and holidays and share it with your friends via mail, Twitter, Facebook or text message 
  • Sunrise and sunset time 
  • Planets View - Shows how all planets of solar system are aligned right now
  • Week number, day number, weekday and year
  • Number of days passed from 1 Jan and days left until 31 Dec
  • Moon phase
  • Day length 
  • Geographic coordinates 
  • No Internet connection required

-- Calendarium uses your location only to provide accurate information about sunrise, sunset times and length of the day. We do not store it in any way. Disabling location settings will disable only these features --

## Key features

- On this day in history
- Sunrise and sunset times
- Planets alignment view
- Moon phase tracking
- Day length calculation
- Offline functionality

## What do users think of Calendarium?

Overall sentiment: positive

**Pros**

- 👍 Interesting historical information
- 🔍 Links to Wikipedia for more details
- 🗓️ Displays sunrise/sunset times and day/week numbers
- 🗓️ Covers events from ancient times to present day

**Cons**

- 🕰️ Events only go up to 2015, app may no longer be supported
- 📅 Can only view current day, no ability to browse past/future dates
- 🌍 Focuses heavily on negative/tragic events, could use more positive content
- 🔍 Tapping events doesn't always link to Wikipedia as expected

**Commonly reported bugs**

- Some dates have no historical information
- Occasional display issues with overlapping text

**Most requested features**

- Add ability to select and view specific dates
- Include more positive/uplifting historical events
- Implement country/region filters to customize content
- Add a widget for quick daily access to information
- Improve app icon and overall visual design

## Recent user reviews (10 of 252)

All indexed reviews: https://appshunter.io/ios/app/calendarium-about-this-day/id482136387/reviews.md

### 4/5 — Sunrise/sunset

*2026-03-01, version 1.8.4*

Please add Sun rise/set times on the iPhone app.

### 1/5 — Out of date

*2026-02-10, version 1.8.4*

No updates since 2017

### 3/5 — No longer supported?

*2025-11-04, version 1.8.4*

Nice app, but events stop at 2015. It appears this app is no longer supported but still interesting for world events on specific days.

### 5/5 — Update

*2025-06-04*

The app needs to be updated, inserting new events after 2017.

### 4/5 — Even better with a country filter

*2024-01-02, version 1.8.4*

Would be even better with a country filter please.

### 5/5 — History Buffs Pay Attention

*2023-11-13, version 1.8.4*

The Calanderium App is visited daily.

As an avid history buff I enjoy learning nuanced moments and interventions that changed the future.  The App selects historical topics that change daily and guide the reader to a more in-depth discussion in Wikipedia.  If a subject interests you, then take the next step and further your research using other resources.

I highly recommend trying this App each evening.

### 5/5 — 2022年迄継続して続けて

*2023-10-15*

歴史は続いています。継続して欲しい。

### 1/5 — Very Depressing, Mostly Bad News

*2023-03-30, version 1.8.4*

I downloaded This app so I could look at each day and learn about major events that happened in history. Unfortunately, very few of the headlines are of a positive nature. You will see lots of entries like “Hitler takes Power….” and “Hundreds killed in…”, but very few “First space flight…” or “Pulitzer Prize awarded to…”

It seems this app skews toward sensationalized, negative, depressing, horrific events. But then again, maybe human history is all about death and destruction, with a sprinkle of highlights. Either way, I no longer want to start each day with a dose of depressing.

### 4/5 — Updates?

*2023-03-16, version 1.8.4*

It would be cool to update the app with some new dates…

### 5/5 — Nice and informative - if you remember to look at it

*2022-06-19, version 1.8.4*

I like this app, full of interesting information and totally absorbing.   However it really needs a widget for desktop display of daily information.

## Frequently asked questions about Calendarium

### What does Calendarium do?

Calendarium provides a daily look into history, including significant events and holidays. It also offers astronomical data such as sunrise and sunset times, moon phases, and planetary alignments for the current day.

### What are the key features of Calendarium?

Key features include 'On this day in history' with sharing options, sunrise/sunset times, a Planets View showing solar system alignment, week and day numbers, moon phase, day length, and geographic coordinates. It also works offline.

### Is Calendarium free to use?

Yes, Calendarium is a free application. It does not have any in-app purchases or advertisements, allowing users to access all its features without cost.

### Does Calendarium require an internet connection?

No, Calendarium does not require an internet connection to function. All its features, including historical data and astronomical information, are available offline.

### How does Calendarium use my location?

Your location is used solely to provide accurate sunrise, sunset times, and day length information. This data is not stored by the app. Disabling location services will only affect these specific features.

## Version history (last 5 releases)

### 1.8.4 — 2020-04-04

- Fixed issue with Today widget background Color

### 1.8.3 — 2018-05-11

Optimisation

### 1.8.2 — 2017-11-12

Support for iPhone X display

### 1.8.1 — 2017-08-09

- Fixed Today Widget - We hope it finally solves the problem for everyone
- Fixed Moon Phase on today widget

### 1.8 — 2017-08-07

- Fixed overlapping text in “More info“ tab when using bigger text 
- Fixed inconsistent margins in main list of events 
- Increased font size in main list of events for easier reading
- Updated list of events now include events from 2015, 2016 and 2017
- Fixed “3 of May“ bug where no events where displayed on that day
- Fixed visual bug with the planet of Saturn on iPads
- Fixed Today Widget

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## More apps by Piotr Knapczyk

- [Planetary Clock](https://appshunter.io/ios/app/planetary-clock/id812876503)
- [Catch The Sun](https://appshunter.io/ios/app/catch-the-sun/id980675701)
- [Contour Color - Coloring App](https://appshunter.io/ios/app/contour-color-coloring-app/id1097861359)
- [Just Rain: Sound & Sight Rain](https://appshunter.io/ios/app/just-rain-sound-and-sight-rain/id1334734492)
- [Weather on the Way](https://appshunter.io/ios/app/weather-on-the-way/id1471394318)

All apps by Piotr Knapczyk: https://appshunter.io/developer/1541886746

## Related topics

[on this day history](https://appshunter.io/ios/topics/on-this-day-history) · [doomsday method](https://appshunter.io/ios/topics/doomsday-method) · [this day in history](https://appshunter.io/ios/topics/this-day-in-history) · [this day](https://appshunter.io/ios/topics/this-day) · [useless information of the day](https://appshunter.io/ios/topics/useless-information-of-the-day) · [of the day](https://appshunter.io/ios/topics/of-the-day) · [today in history lite edition](https://appshunter.io/ios/topics/today-in-history-lite-edition) · [on this day](https://appshunter.io/ios/topics/on-this-day) · [today in history](https://appshunter.io/ios/topics/today-in-history) · [fun fact of the day](https://appshunter.io/ios/topics/fun-fact-of-the-day) · [weekdaywidget](https://appshunter.io/ios/topics/weekdaywidget)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-28.*