Brief notes about astronomy topics, commonly issued by e-mail to people that want to learn the basis of astronomy and begin to observe the sky.

Last notes issued (2014-Jan to 2024-May)

(pdf files)

These notes are translated to english.

• 294: Partial Lunar Eclipse (2021-November-19)
• 292: Jupiter and Saturn Conjunction (2020-December-12)
• 291: Solar Total Eclipse (2020-December-10)
• 290: Geminids Meteor Shower (2020-December-09)
• 289: Mars Opposition (2020-October-10)
• 288: Spring/Fall begins this Tuesday 22! (2020-September-20)
• 287: Mars occultation photographs! (2020-September-06)
• 286: Moon occults Mars! (2020-September-02)
• 285: An asteroid is approaching Earth (2020-August-29)
• 284: ISS (2020-August-15)
• 283: The Perseids meteor shower (2020-August-10)
• 282: The NEOWISE comet from Cochabamba (2020-July-24)
• 281: The ISS, the 5 planets and a nova (2020-July-19)


These notes are written in spanish.

• 342: Celestial phenomena in December 2024 (spanish text)
• 341: In the No Shadow Day (spanish text)
• 340: Celestial phenomena in November 2024 (spanish text)
• 339: Celestial phenomena in October 2024 (spanish text)
• 338: Annular Solar Eclipse (spanish text)
• 337: Celestial phenomena in September 2024 (spanish text)
• 336: Celestial phenomena in August 2024 (spanish text)
• 335: Celestial phenomena in July 2024 (spanish text)
• 334: Celestial phenomena in June 2024 (spanish text)
• 333: Celestial phenomena in May 2024 (spanish text)
• 332: Celestial phenomena in April 2024 (spanish text)
• 331: Celestial phenomena in March 2024 (spanish text)
• 330: Celestial phenomena in February 2024 (spanish text)
• ASO Annual Report 2023 (spanish text)
• 329: Celestial phenomena in January 2024 (spanish text)
• 328: Minor Bodies Astrometry (spanish text)
• 327: The sky in December 2023 (spanish text)
• 326: The sky in November 2023 (spanish text)
• 325: Partial Eclipse of the Sun 2023 (spanish text)
• 324: The sky in October 2023 (spanish text)
• 323: The sky in September 2023 (spanish text)
• 322: Amateur Spectroscopy (spanish text)
• 321: The sky in August 2023 (spanish text)
• 320: The sky in July 2023 (spanish text)
• 319: The sky in June 2023 (spanish text)
• 318: The sky in May 2023 (spanish text)
• 317: The sky in April 2023 (spanish text)
• 316: The sky in March 2023 (spanish text)
• 315: The sky in February 2023 (spanish text)
• The ASO Bulletin 2022
• 314: The sky in January 2023
• 313: Discover December - Dec 2022
• 312: Discover November - Nov 2022
• 311: Discover October - Oct 2022
• 310: Discover September - Sep 2022
• 309: Discover August - Jul 2022
• 308: Discover July - Jul 2022
• 307: Discover June - Jun 2022
• 306: Alert - Possible Spectacular Meteor Shower - May 2022
• 305: This is how we saw it: Total Lunar Eclipse - May 2022
• 304: Total Lunar Eclipse - May 2022
• 303: Discover May 2022
• 302: Discover April 2022
• 301: Photometry Learning - First steps(spanish text)
• 300: ASO's 45 years and German our founder
• 299: Discover March 2022
• 298: Discover February 2022
• 297: Discover January 2022
• 296: The Leonard Comet (2021-December)
• 295: How we lived it : Partial Lunar Eclipse photos (2021-November-19)
• 293: A lunar eclipse that we cannot see in Bolivia (2021-May-25)
• 280: Watch the ISS and some thoughts about it (2020-July-11)
• 279: All the planets, comets, and ... (2020-July-10)
• 278: The Begining of Winter/Summer (2020-June-19)
• 277: UFOs over Cochabamba ????(2020-June-18)
• 276: New Starlink lunch (2020-June-07)
• 275: ISS & Starlink, again !!(2020-May-10)
• 274: A meteor shower! a comet and the planets at dawn! (2020-May-01)
• 273: A new comet! (2020-April-29)
• 272: When asteroids collide ...! (2020-April-27)
• 271: ISS for Bolivia ! (2020-April-16)
• 270: Learning some constellations and star names, & finding the planets ! (2020-April-08)
• 269: Supermoon, a nonsense qualification. (2020-April-07)
• 268: Venus & Pleiades !! (2020-April-06)
• 267: Venus & Moon pictures !! (2020-March-28)
• 266: Finding the planets in the sky! (2020-March-25)
• 265: Fall/Spring time (South/North) (2020-March-18)
• 264: ASO 43 anniversary, pi day and ... (2020-March-13)
• 263: StarLink watching them but thinking of astronomical future (2020-February-22)
• 262: Venus - Jupiter Conjunction (2019-November-22)
• 261: Leonids & Starlink (2019-November-16)
• 260: Transit! (2019-November-08)
• 259: September Equinox (2019-September-20)
• 258: 50 years from the first moonlanding (2019-July-19)
• 257: A lunar eclipse, Moon occults saturn, Opposition, and 50 years of ... (2019-July-14)
• 256: A brief comment and pictures about the last Solar Total Eclipse (2019-July-10)
• 255: Totality! (2019-June-26)
• 254: June's Solstice (2019-June-21)
• 253: Jupiter Opposition (2019-June-10)
• 252: Observing the Sun (2019-May-31)
• 251: General Relativity Theory, a century from its first validation (2019-May-27)
• 250: March Equinox, about climate change(2019-March-19)
• 249: Lunar Total Eclipse ! (2019-January-17)
• 248: Planets, Eclipses & meteors in the begining of 2019. (2018-December-30)
• 247: Summer/Winter is beginning! and other news (2018-December-21)
• 246: Equinox! (2018-September-20)
• 245: Perseids this weekend! (2018-August-10)
• 244: The nonsense about Mars apparent size (2018-July-25)
• 243: Mars Opposition + Lunar Eclipse and five planets to observe (2018-July-24)
• 242: Jupiter Opposition (2018-mayo-08)
• 241: Vernal Equinox (2018-March-20)
• 240: ASO, Einstein, Hawking and Pi day (2018-March-14)
• 239: Nonsenses in Newspapers about Lunar Eclipse (2018-February-01)
• 238: Lunar Eclipse, blue moon or purple moon? (2018-January-30)
• 237: Jupiter & Mars conjunction (2018-January-06)
• 236: supermoons and blue moons (2018-January-01)
• 235: Leonids meteor shower and ISS pass over Bolivia (2017-November-15)
• 234: The Orionids meteor shower this weekend (2017-October-19)
• 233: Asteroid flyby on October 12(2017-October-09)
• 232: The first satellite - Sputnik, 60 years (2017-October-02)
• 231: Autumn/Spring Equinox (2017-September-20)
• 230: About Earthquakes, a brief explanation (2017-September-20)
• 229: 4 days of darkness? (2017-August-15)
• 228: Perseids meteor shower (2017-August-11)
• 227: About 2017 August Total Eclipse nonsense news (2017-August-10)
• 226: Sunday's Solar Eclipse Pictures (2017-February-26)
• 225: Sunday's Solar Eclipse (2017-February-22)
• 224: 2016 Leap Second (2016-December-29)
• 223: Supermoon ? (2016-November-12)
• 222: Equinox! (2016-September-20)
• 221: The ISS tonight! (2016-September-20)
• 220: Magnificent Jupiter and Venus Conjunction (2016-August-26)
• 219: Spectacular meteor shower (2016-August-10)
• 218: Planets' Night, a public free telescope observation (2016-June-20)
• 217: June's Solstice (2016-June-19)
• 216: Mars and Saturn oppositions (2016-May-21)
• 215: Mercury Transit !! (2016-May-05)
• 214: Meteor shower from Halley's comet particles (2016-May-04)
• 213: March Equinox! (2016-March-19)
• 212: ASO's 39th anniversary (2016-March-14)
• 211: Jupiter at Opposition (2016-March-07)
• 210: Lunar Eclipse! (2015-September-24)
• 209: Equinox! (2015-September-21)
• 208: Perseid meteor shower! (2015-August-11)
• 207: News from Pluto! (2015-July-16)
• 206: New Horizons' closest approach to Pluto! (2015-July-10)
• 205: The ISS crossing the sky, passing near to Jupiter and Venus (2015-July-02)
• 204: A leap second again (2015-June-29)
• 203: Venus and Jupiter together in the eyepiece's field (2015-June-28)
• 202: Moon, Jupiter and Venus in the evening (2015-June-19)
• 201: Watch the ISS again (2015-May-27)
• 200: Saturn's opposition (2015-May-18)
• 199: Moon and Saturn near in the sky (2015-mayo-04)
• 198: Watch the ISS crossing the sky and the Progress-M 27M failed module. (2015-May-01)
• 197: Venus & Jupiter (2015-April-25)
• 196: Eclipse of the Moon (2015-April-03)
• 195: Autumn Equinox (2015-March-20)
• 194: 38 years of ASO! (2015-March-12)
• 193: A very big Moon (2014-septiembre-07)
• 192: A triangle in the sky (2014-agosto-31)
• 191: Venus & Jupiter Conjunction (2014-agosto-17)
• 190: Perseids! (2014-August-10)
• 189: A very big Moon(2014-August-08)
• 188: Misconceptions about a meteor shower in a local newspaper (2014-July-29)
• 187: Moon - Mars occultation (2014-july-05)
• 186: Earth's Aphelion (2014-july-03)
• 185: Looking at the Galaxy's core (2014-July-02)
• 184: Winter Solstice (South) (2014-June-20)
• 183: Moon and Saturn Conjunction (2014-June-10)
• 182: Moon and Mars Conjunction (2014-June-06)
• 181: Jupiter and the Moon (2014-May-31)
• 180: Dawn show (2014-May-23)
• 179: Meteor storm? (2014-May-23)
• 178: Lunar Total Eclipse of 20014-04-15 (2014-April-12)
• 177: Mars Opposition (2014-April-08)
• 176: Jupiter and Moon conjunction (2014-April-06)
• 175: clouds: stratus (2014-March-27)
• 174: The beginning of Autumn (South Hemisphere), March Equinox (2014-March-20)
• 173: About the clouds (2014-March-16)
• 172: A Solar Flare and CME associated to the giant Sunspot (2014-January-08)
• 171: An Asteroid collide with our Planet (2014-January-06)
• 170: A big sunspots group (2014-January-05)
• 169: Jupiter's Opposition (2014-January-05)
• 168: Earth at Perihelion (2014-January-02)

Year 2009 (The starting of sending notes)

(pdf files)

• 029: La Gran Ola!! (2009-diciembre-29)
• 028: La Estrella más Brillante dle Cielo (2009-diciembre-23)
• 027: Alineación del Sol con el Centro de la Galaxia (2009-diciembre-16)
• 026: La Última Lluvia de Estrellas del Año (2009-diciembre-10)
• 025: Orión y el Nacimiento de las Estrellas (2009-diciembre-02)
• 024: Agua en la Luna!! (2009-noviembre-23)
• 023: Otra Lluvia de Estrellas!! (2009-noviembre-15)
• 022: El Sol en Nuestro Cenit (2009-noviembre-09)
• 021: Galaxia a la Vista!! (2009-noviembre-04)
• 020: Mares en la Luna (2009-octubre-27)
• 019: Lluvia de Estrellas: Los restos del Cometa Halley? (2009-octubre-18)
• 018: Conjunción Venus - Saturno (2009-octubre-12)
• 017: Observemos a la Estación Espacial Internacional!!! (2009-octubre-03)
• 016: Conjunción Luna - Júpiter (2009-septiembre-27)
• 015: Equinoccio de Primavera / Otoño (2009-septiembre-20)
• 014: El Triángulo del Norte: Vega, Deneb y Altair (2009-septiembre-15)
• 013: Las Estrellas se mueven? (2009-septiembre-08)
• 012: La constelación del Cisne (2009-septiembre-01)
• 011: La estrella Vega y los Exoplanetas (2009-agosto-24)
• 010: Sagitario y el Centro de la Galaxia (2009-agosto-17)
• 009: Lluvia de Estrellas!!! Las Perseidas (2009-agosto-10)
• 008: Júpiter en Capricornio (2009-agosto-03)
• 007: Observando nuestra Galaxia (2009-julio-26)
• 006: La Luna y su luz cenicienta (2009-julio-19)
• 005: Especial - La Tierra desde la Luna (2009-julio-19)
• 004: Las Constelaciones: El Escorpión (2009-julio-06)
• 003: Las Constelaciones: la Cruz del Sur y Centauro (2009-julio-06)
• 002: De Luna Nueva a Luna LLena (2009-junio-28)
• 001: 21 - Junio: Solsticio de Invierno (2009-junio-21)

About non astronomical topics

(pdf files)

• Treking by Cochabamba's mountains. (2017-April-04)