The recalibration of the sunspot number series, the primary long-term record of the solar cycle, requires the recovery of the entire collection of raw sunspot counts collected by the Zurich Observatory for the production of this index between 1849 and 1980.

Here, we report about the major progresses accomplished recently in the construction of this global digital sunspot number database, and we derive global statistics of all the individual observers and professional observatories who provided sunspot data over more than 130 years.

First, we can announce the full recovery of long-lost source-data tables covering the last 34 years between 1945 and 1979, and we describe the unique information available in those tables. We then also retrace the evolution of the core observing team in Zurich and of the auxiliary stations. In 1947, we find a major disruption in the composition of both the Zurich team and the international network of auxiliary stations.

This sharp transition is unique in the history of the Zurich Observatory and coincides with the main scale-jump found in the original Zurich sunspot number series, the so-called “Waldmeier” jump. This adds key historical evidence explaining why methodological changes introduced progressively in the early 20th century could play a role precisely at that time. We conclude on the remaining steps needed to fully complete this new sunspot data resource.

太阳黑子数列的重新校准是太阳活动周期的主要长期记录，需要恢复苏黎世天文台在 1849 年至 1980 年间为制作该指数而收集的整个原始太阳黑子计数集。

在这里，我们报告了最近在这个全球数字太阳黑子数数据库建设方面取得的重大进展，并推导出了 130 多年来提供太阳黑子数据的所有个人观测者和专业天文台的全球统计数据。

首先，我们可以宣布完全恢复涵盖 1945 年至 1979 年之间过去 34 年的长期丢失的源数据表，并描述这些表中可用的唯一信息。然后，我们还追溯了苏黎世核心观测团队和辅助站的演变。1947 年，我们发现苏黎世团队和国际辅助站网络的组成都出现了重大中断。

这种急剧的转变在苏黎世天文台的历史上是独一无二的，与原始苏黎世太阳黑子数列中发现的主要尺度跳跃相吻合，即所谓的“瓦尔德迈尔”跳跃。这增加了关键的历史证据，解释了为什么在 20 世纪早期逐步引入的方法论变化可以在当时发挥作用。我们总结了完全完成这个新的太阳黑子数据资源所需的剩余步骤。